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A door is a
hinge A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation: all other ...
d or otherwise movable barrier that allows ingress (entry) into and egress (exit) from an enclosure. The created opening in the
wall A wall is a structure and a surface that defines an area; carries a load; provides security, shelter, or soundproofing; or, is decorative. There are many kinds of walls, including: * Walls in buildings that form a fundamental part of the supe ...
is a ''doorway'' or ''portal''. A door's essential and primary purpose is to provide
security Security is protection from, or resilience against, potential harm (or other unwanted coercive change) caused by others, by restraining the freedom of others to act. Beneficiaries (technically referents) of security may be of persons and social ...
by controlling access to the doorway (portal). Conventionally, it is a panel that fits into the doorway of a
building A building, or edifice, is an enclosed structure with a roof and walls standing more or less permanently in one place, such as a house or factory (although there's also portable buildings). Buildings come in a variety of sizes, shapes, and fun ...
, room, or
vehicle A vehicle (from la, vehiculum) is a machine that transports people or cargo. Vehicles include wagons, bicycles, motor vehicles (motorcycles, cars, trucks, buses, mobility scooters for disabled people), railed vehicles (trains, trams), wa ...
. Doors are generally made of a material suited to the door's task. They are commonly attached by hinges, but can move by other means, such as slides or counterbalancing. The door may be able to move in various ways (at angles away from the doorway/portal, by sliding on a plane parallel to the frame, by folding in angles on a parallel plane, or by spinning along an axis at the center of the frame) to allow or prevent ingress or egress. In most cases, a door's interior matches its exterior side. But in other cases (e.g., a vehicle door) the two sides are radically different. Many doors incorporate locking mechanisms to ensure that only some people can open them (such as with a
key Key or The Key may refer to: Common meanings * Key (cryptography), a piece of information that controls the operation of a cryptography algorithm * Key (lock), device used to control access to places or facilities restricted by a lock * Key (map ...
). Doors may have devices such as knockers or
doorbell A doorbell is a signaling device typically placed near a door to a building's entrance. When a visitor presses a button, the bell rings inside the building, alerting the occupant to the presence of the visitor. Although the first doorbells were ...
s by which people outside announce their presence. (In some countries, such as Brazil, it is customary to clap from the sidewalk to announce one's presence.) Apart from providing access into and out of a space, doors may have the secondary functions of ensuring privacy by preventing unwanted attention from outsiders, of separating areas with different functions, of allowing
light Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 tera ...
to pass into and out of a space, of controlling ventilation or
air draft Air draft (or air draught) is the distance from the surface of the water to the highest point on a vessel. This is similar to the " deep draft" of a vessel which is measured from the surface of the water to the deepest part of the hull below th ...
s so that interiors may be more effectively heated or cooled, of dampening
noise Noise is unwanted sound considered unpleasant, loud or disruptive to hearing. From a physics standpoint, there is no distinction between noise and desired sound, as both are vibrations through a medium, such as air or water. The difference arise ...
, and of blocking the spread of
fire Fire is the rapid oxidation of a material (the fuel) in the exothermic chemical process of combustion, releasing heat, light, and various reaction Product (chemistry), products. At a certain point in the combustion reaction, called the ignition ...
. Doors can have
aesthetic Aesthetics, or esthetics, is a branch of philosophy that deals with the nature of beauty and taste, as well as the philosophy of art (its own area of philosophy that comes out of aesthetics). It examines aesthetic values, often expressed th ...
,
symbol A symbol is a mark, sign, or word that indicates, signifies, or is understood as representing an idea, object, or relationship. Symbols allow people to go beyond what is known or seen by creating linkages between otherwise very different conc ...
ic,
ritual A ritual is a sequence of activities involving gestures, words, actions, or objects, performed according to a set sequence. Rituals may be prescribed by the traditions of a community, including a religious community. Rituals are characterized, b ...
istic purposes. Receiving the
key Key or The Key may refer to: Common meanings * Key (cryptography), a piece of information that controls the operation of a cryptography algorithm * Key (lock), device used to control access to places or facilities restricted by a lock * Key (map ...
to a door can signify a change in status from outsider to insider. Doors and doorways frequently appear in
literature Literature is any collection of written work, but it is also used more narrowly for writings specifically considered to be an art form, especially prose fiction, drama, and poetry. In recent centuries, the definition has expanded to include ...
and
the arts The arts are a very wide range of human practices of creative expression, storytelling and cultural participation. They encompass multiple diverse and plural modes of thinking, doing and being, in an extremely broad range of media. Both ...
with
metaphor A metaphor is a figure of speech that, for rhetorical effect, directly refers to one thing by mentioning another. It may provide (or obscure) clarity or identify hidden similarities between two different ideas. Metaphors are often compared wit ...
ical or allegorical import as a portent of change.


History

The earliest recorded doors appear in the paintings of
Egyptian Egyptian describes something of, from, or related to Egypt. Egyptian or Egyptians may refer to: Nations and ethnic groups * Egyptians, a national group in North Africa ** Egyptian culture, a complex and stable culture with thousands of years of ...
tombs, which show them as single or double doors, each of a single piece of wood. People may have believed these were doors to the afterlife, and some include designs of the afterlife. In Egypt, where the climate is intensely dry, doors weren't framed against warping, but in other countries required framed doors—which, according to
Vitruvius Vitruvius (; c. 80–70 BC – after c. 15 BC) was a Roman architect and engineer during the 1st century BC, known for his multi-volume work entitled ''De architectura''. He originated the idea that all buildings should have three attribute ...
(iv. 6.) was done with stiles (sea/si) and rails ''(see:
Frame and panel Frame and panel construction, also called rail and stile, is a woodworking technique often used in the making of doors, wainscoting, and other decorative features for cabinets, furniture, and homes. The basic idea is to capture a 'floating' panel ...
)'', the enclosed panels filled with tympana set in grooves in the stiles and rails. The stiles were the vertical boards, one of which, tenoned or
hinge A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation: all other ...
d, is known as the hanging stile, the other as the middle or meeting stile. The horizontal cross pieces are the top rail, bottom rail, and middle or intermediate rails. The most ancient doors were made of timber, such as those referred to in the Biblical depiction of
King Solomon's temple Solomon's Temple, also known as the First Temple (, , ), was the Temple in Jerusalem between the 10th century BC and . According to the Hebrew Bible, it was commissioned by Solomon in the United Kingdom of Israel before being inherited by th ...
being in olive wood (I Kings vi. 31–35), which were carved and overlaid with gold. The doors that
Homer Homer (; grc, Ὅμηρος , ''Hómēros'') (born ) was a Greek poet who is credited as the author of the ''Iliad'' and the ''Odyssey'', two epic poems that are foundational works of ancient Greek literature. Homer is considered one of the ...
mentions appear to have been cased in silver or brass. Besides olive wood,
elm Elms are deciduous and semi-deciduous trees comprising the flowering plant genus ''Ulmus'' in the plant family Ulmaceae. They are distributed over most of the Northern Hemisphere, inhabiting the temperate and tropical-montane regions of North ...
, cedar,
oak An oak is a tree or shrub in the genus ''Quercus'' (; Latin "oak tree") of the beech family, Fagaceae. There are approximately 500 extant species of oaks. The common name "oak" also appears in the names of species in related genera, notably ''L ...
and
cypress Cypress is a common name for various coniferous trees or shrubs of northern temperate regions that belong to the family Cupressaceae. The word ''cypress'' is derived from Old French ''cipres'', which was imported from Latin ''cypressus'', the ...
were used. A 5,000-year-old door has been found by archaeologists in Switzerland. Ancient doors were hung by
pintle A pintle is a pin or bolt, usually inserted into a gudgeon, which is used as part of a pivot or hinge. Other applications include pintle and lunette ring for towing, and pintle pins securing casters in furniture. Use Pintle/gudgeon sets have ma ...
s at the top and bottom of the hanging stile, which worked in sockets in the
lintel A lintel or lintol is a type of beam (a horizontal structural element) that spans openings such as portals, doors, windows and fireplaces. It can be a decorative architectural element, or a combined ornamented structural item. In the case of w ...
and
sill Sill may refer to: * Sill (dock), a weir at the low water mark retaining water within a dock * Sill (geology), a subhorizontal sheet intrusion of molten or solidified magma * Sill (geostatistics) * Sill (river), a river in Austria * Sill plate, a ...
, the latter in some hard stone such as
basalt Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial ...
or
granite Granite () is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies undergro ...
. Those Hilprecht found at
Nippur Nippur (Sumerian language, Sumerian: ''Nibru'', often logogram, logographically recorded as , EN.LÍLKI, "Enlil City;"The Cambridge Ancient History: Prolegomena & Prehistory': Vol. 1, Part 1. Accessed 15 Dec 2010. Akkadian language, Akkadian: '' ...
, dating from 2000 BC, were in
dolerite Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grained ...
. The tenons of the
gate A gate or gateway is a point of entry to or from a space enclosed by walls. The word derived from old Norse "gat" meaning road or path; But other terms include ''yett and port''. The concept originally referred to the gap or hole in the wall ...
s at
Balawat Balawat ( syc, ܒܝܬ ܠܒܬ, ') is an archaeological site of the ancient Assyrian city of Imgur-Enlil, and modern village in Nineveh Province (Iraq). It lies southeast from the city of Mosul and to the south of the modern Assyrian town of Bakh ...
were sheathed with bronze (now in the
British Museum The British Museum is a public museum dedicated to human history, art and culture located in the Bloomsbury area of London. Its permanent collection of eight million works is among the largest and most comprehensive in existence. It docum ...
). These doors or gates were hung in two leaves, each about wide and high; they were encased with bronze bands or strips, high, covered with repoussé decoration of figures. The wood doors would seem to have been about thick, but the hanging stile was over diameter. Other sheathings of various sizes in bronze show this was a universal method adopted to protect the wood pivots. In the
Hauran The Hauran ( ar, حَوْرَان, ''Ḥawrān''; also spelled ''Hawran'' or ''Houran'') is a region that spans parts of southern Syria and northern Jordan. It is bound in the north by the Ghouta oasis, eastwards by the al-Safa (Syria), al-Safa ...
in Syria where timber is scarce, the doors were made of stone, and one measuring by is in the British Museum; the band on the meeting stile shows that it was one of the leaves of a double door. At Kuffeir near Bostra in Syria, Burckhardt found stone doors, high, being the entrance doors of the town. In
Etruria Etruria () was a region of Central Italy, located in an area that covered part of what are now most of Tuscany, northern Lazio, and northern and western Umbria. Etruscan Etruria The ancient people of Etruria are identified as Etruscan civiliza ...
many stone doors are referred to by Dennis. Ancient Greek and
Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of ancient Rome *''Epistle to the Romans'', shortened to ''Romans'', a letter ...
doors were either single doors, double doors, triple doors, sliding doors or
folding door A folding door is a type of door which opens by folding back in sections or so-called panels. Folding doors are also known as ‘bi-fold doors', in spite of them most often having more than two panels. Another term is ‘concertina’ doors, ...
s, in the last case the leaves were hinged and folded back. In the tomb of Theron at
Agrigentum Agrigento (; scn, Girgenti or ; grc, Ἀκράγας, translit=Akrágas; la, Agrigentum or ; ar, كركنت, Kirkant, or ''Jirjant'') is a city on the southern coast of Sicily, Italy and capital of the province of Agrigento. It was one of ...
there is a single four-panel door carved in stone. In the Blundell collection is a
bas-relief Relief is a sculptural method in which the sculpted pieces are bonded to a solid background of the same material. The term ''relief'' is from the Latin verb ''relevo'', to raise. To create a sculpture in relief is to give the impression that the ...
of a temple with double doors, each leaf with five panels. Among existing examples, the bronze doors in the church of SS. Cosmas and Damiano, in Rome, are important examples of Roman metal work of the best period; they are in two leaves, each with two panels, and are framed in bronze. Those of the
Pantheon Pantheon may refer to: * Pantheon (religion), a set of gods belonging to a particular religion or tradition, and a temple or sacred building Arts and entertainment Comics *Pantheon (Marvel Comics), a fictional organization * ''Pantheon'' (Lone St ...
are similar in design, with narrow horizontal panels in addition, at the top, bottom and middle. Two other bronze doors of the Roman period are in the
Lateran Basilica The Archbasilica Cathedral of the Most Holy Savior and of Saints John the Baptist and John the Evangelist in the Lateran ( it, Arcibasilica del Santissimo Salvatore e dei Santi Giovanni Battista ed Evangelista in Laterano), also known as the Papa ...
. The Greek scholar Heron of Alexandria created the earliest known automatic door in the first century AD during the era of
Roman Egypt , conventional_long_name = Roman Egypt , common_name = Egypt , subdivision = Province , nation = the Roman Empire , era = Late antiquity , capital = Alexandria , title_leader = Praefectus Augustalis , image_map = Roman E ...
.Needham, Joseph. (1986). ''Science and Civilization in China: Volume 4, Part 2, Mechanical Engineering''. Taipei: Caves Books, Ltd. The first foot-sensor-activated automatic door was made in China during the reign of
Emperor Yang of Sui Emperor Yang of Sui (隋煬帝, 569 – 11 April 618), personal name Yang Guang (), alternative name Ying (), Xianbei name Amo (), also known as Emperor Ming of Sui () during the brief reign of his grandson Yang Tong, was the second emperor of ...
(r. 604–618), who had one installed for his royal library. Gates powered by water featured in illustrations of the automatons of the Arab inventor
Al-Jazari Badīʿ az-Zaman Abu l-ʿIzz ibn Ismāʿīl ibn ar-Razāz al-Jazarī (1136–1206, ar, بديع الزمان أَبُ اَلْعِزِ إبْنُ إسْماعِيلِ إبْنُ الرِّزاز الجزري, ) was a polymath: a scholar, ...
. Copper and its alloys were integral in
medieval In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the Post-classical, post-classical period of World history (field), global history. It began with t ...
architecture. The doors of the
church of the Nativity The Church of the Nativity, or Basilica of the Nativity,; ar, كَنِيسَةُ ٱلْمَهْد; el, Βασιλική της Γεννήσεως; hy, Սուրբ Ծննդեան տաճար; la, Basilica Nativitatis is a basilica located in B ...
at
Bethlehem Bethlehem (; ar, بيت لحم ; he, בֵּית לֶחֶם '' '') is a city in the central West Bank, Palestine, about south of Jerusalem. Its population is approximately 25,000,Amara, 1999p. 18.Brynen, 2000p. 202. and it is the capital o ...
(6th century) are covered with plates of bronze, cut out in patterns. Those of
Hagia Sophia Hagia Sophia ( 'Holy Wisdom'; ; ; ), officially the Hagia Sophia Grand Mosque ( tr, Ayasofya-i Kebir Cami-i Şerifi), is a mosque and major cultural and historical site in Istanbul, Turkey. The cathedral was originally built as a Greek Ortho ...
at
Constantinople la, Constantinopolis ota, قسطنطينيه , alternate_name = Byzantion (earlier Greek name), Nova Roma ("New Rome"), Miklagard/Miklagarth (Old Norse), Tsargrad ( Slavic), Qustantiniya (Arabic), Basileuousa ("Queen of Cities"), Megalopolis (" ...
, of the eighth and ninth century, are wrought in bronze, and the west doors of the cathedral of
Aix-la-Chapelle Aachen ( ; ; Aachen dialect: ''Oche'' ; French and traditional English: Aix-la-Chapelle; or ''Aquisgranum''; nl, Aken ; Polish: Akwizgran) is, with around 249,000 inhabitants, the 13th-largest city in North Rhine-Westphalia, and the 28th- ...
(9th century), of similar manufacture, were probably brought from Constantinople, as also some of those in St. Marks, Venice. The bronze doors on the Aachen Cathedral in Germany date back to about 800 AD. Bronze baptistery doors at the Cathedral of Florence were completed in 1423 by Ghiberti. ''(For more information, see: Copper in architecture).'' Of the 11th and 12th centuries there are numerous examples of bronze doors, the earliest being one at
Hildesheim Hildesheim (; nds, Hilmessen, Hilmssen; la, Hildesia) is a city in Lower Saxony, Germany with 101,693 inhabitants. It is in the district of Hildesheim, about southeast of Hanover on the banks of the Innerste River, a small tributary of the Lei ...
, Germany (1015). The Hildesheim design affected the concept of Gniezno door in Poland. Of others in South Italy and Sicily, the following are the finest: in Sant'Andrea,
Amalfi Amalfi (, , ) is a town and ''comune'' in the province of Salerno, in the region of Campania, Italy, on the Gulf of Salerno. It lies at the mouth of a deep ravine, at the foot of Monte Cerreto (1,315 metres, 4,314 feet), surrounded by dramatic c ...
(1060);
Salerno Salerno (, , ; nap, label= Salernitano, Saliernë, ) is an ancient city and ''comune'' in Campania (southwestern Italy) and is the capital of the namesake province, being the second largest city in the region by number of inhabitants, after ...
(1099); Canosa di Puglia (1111); Troia, two doors (1119 and 1124);
Ravello Ravello (Campanian: ) is a town and ''comune'' situated above the Amalfi Coast in the province of Salerno, Campania, Southern Italy, with approximately 2,500 inhabitants. Its scenic location makes it a popular tourist destination, and earned it a ...
(1179), by Barisano of Trani, who also made doors for
Trani cathedral Trani Cathedral ( it, Cattedrale di Trani; Cattedrale di San Nicola Pellegrino) is a Roman Catholic cathedral dedicated to Saint Nicholas the Pilgrim in Trani, Apulia, south-eastern Italy. Formerly the seat of the archbishop of Trani, it is now th ...
; and in
Monreale Monreale (; ; Sicilian: ''Murriali'') is a town and ''comune'' in the Metropolitan City of Palermo, in Sicily, southern Italy. It is located on the slope of Monte Caputo, overlooking the very fertile valley called ''"La Conca d'oro"'' (the Golde ...
and
Pisa Pisa ( , or ) is a city and ''comune'' in Tuscany, central Italy, straddling the Arno just before it empties into the Ligurian Sea. It is the capital city of the Province of Pisa. Although Pisa is known worldwide for its leaning tower, the cit ...
cathedrals, by Bonano of Pisa. In all these cases the hanging stile had pivots at the top and bottom. The exact period when the builder moved to the hinge is unknown, but the change apparently brought about another method of strengthening and decorating doors—wrought-iron bands of various designs. As a rule, three bands with ornamental work constitute the hinges, with rings outside the hanging stiles that fit on vertical tenons set into the masonry or wooden frame. There is an early example of the 12th century in Lincoln. In France, the metalwork of the doors of Notre Dame at Paris is a beautiful example, but many others exist throughout France and England. In Italy, celebrated doors include those of the
Battistero di San Giovanni (Florence) The Florence Baptistery, also known as the Baptistery of Saint John ( it, Battistero di San Giovanni), is a religious building in Florence, Italy, and has the status of a minor basilica. The octagonal baptistery stands in both the Piazza del ...
, which are all in bronze—including the door frames. The modeling of the figures, birds and foliage of the south doorway, by
Andrea Pisano Andrea Pisano (Pontedera 12901348 Orvieto) also known as Andrea da Pontedera, was an Italian sculptor and architect. Biography Pisano first learned the trade of a goldsmith. Pisano then became a pupil of Mino di Giovanni, about 1300, and work ...
(1330), and of the east doorway by
Ghiberti Lorenzo Ghiberti (, , ; 1378 – 1 December 1455), born Lorenzo di Bartolo, was an Italian Renaissance sculptor from Florence, a key figure in the Early Renaissance, best known as the creator of two sets of bronze doors of the Florence Baptistery ...
(1425–1452), are of great beauty. In the north door (1402–1424), Ghiberti adopted the same scheme of design for the paneling and figure subjects as Andrea Pisano, but in the east door, the rectangular panels are all filled, with bas-reliefs that illustrate Scripture subjects and innumerable figures. These may the gates of Paradise of which
Michelangelo Michelangelo di Lodovico Buonarroti Simoni (; 6 March 1475 – 18 February 1564), known as Michelangelo (), was an Italian sculptor, painter, architect, and poet of the High Renaissance. Born in the Republic of Florence, his work was insp ...
speaks. Doors of the mosques in
Cairo Cairo ( ; ar, القاهرة, al-Qāhirah, ) is the capital of Egypt and its largest city, home to 10 million people. It is also part of the largest urban agglomeration in Africa, the Arab world and the Middle East: The Greater Cairo metro ...
were of two kinds: those externally cased with sheets of bronze or iron, cut in decorative patterns, and incised or inlaid, with bosses in relief; and those of wood-framed with interlaced square and diamond designs. The latter design is Coptic in origin. The doors of the palace at
Palermo Palermo ( , ; scn, Palermu , locally also or ) is a city in southern Italy, the capital (political), capital of both the autonomous area, autonomous region of Sicily and the Metropolitan City of Palermo, the city's surrounding metropolitan ...
, which were made by Saracenic workmen for the
Normans The Normans (Norman language, Norman: ''Normaunds''; french: Normands; la, Nortmanni/Normanni) were a population arising in the medieval Duchy of Normandy from the intermingling between Norsemen, Norse Viking settlers and indigenous West Fran ...
, are fine examples in good preservation. A somewhat similar decorative class of door is found in
Verona Verona ( , ; vec, Verona or ) is a city on the Adige River in Veneto, Northern Italy, Italy, with 258,031 inhabitants. It is one of the seven provincial capitals of the region. It is the largest city Comune, municipality in the region and the ...
, where the edges of the stiles and rails are beveled and notched. In the Renaissance period, Italian doors are quite simple, their architects trusting more to the doorways for effect; but in France and Germany the contrary is the case, the doors being elaborately carved, especially in the
Louis XIV , house = Bourbon , father = Louis XIII , mother = Anne of Austria , birth_date = , birth_place = Château de Saint-Germain-en-Laye, Saint-Germain-en-Laye, France , death_date = , death_place = Palace of Vers ...
and
Louis XV Louis XV (15 February 1710 – 10 May 1774), known as Louis the Beloved (french: le Bien-Aimé), was King of France from 1 September 1715 until his death in 1774. He succeeded his great-grandfather Louis XIV at the age of five. Until he reache ...
periods, and sometimes with architectural features such as columns and entablatures with pediment and niches, the doorway being in plain masonry. While in Italy the tendency was to give scale by increasing the number of panels, in France the contrary seems to have been the rule; and one of the great doors at
Fontainebleau Fontainebleau (; ) is a commune in the metropolitan area of Paris, France. It is located south-southeast of the centre of Paris. Fontainebleau is a sub-prefecture of the Seine-et-Marne department, and it is the seat of the ''arrondissement ...
, which is in two leaves, is entirely carried out as if consisting of one great panel only. The earliest
Renaissance The Renaissance ( , ) , from , with the same meanings. is a period in European history marking the transition from the Middle Ages to modernity and covering the 15th and 16th centuries, characterized by an effort to revive and surpass ideas ...
doors in France are those of the cathedral of St. Sauveur at
Aix Aix or AIX may refer to: Computing * AIX, a line of IBM computer operating systems *An Alternate Index, for a Virtual Storage Access Method Key Sequenced Data Set *Athens Internet Exchange, a European Internet exchange point Places Belgium ...
(1503). In the lower panels there are figures . high in
Gothic Gothic or Gothics may refer to: People and languages *Goths or Gothic people, the ethnonym of a group of East Germanic tribes **Gothic language, an extinct East Germanic language spoken by the Goths **Crimean Gothic, the Gothic language spoken b ...
niches, and in the upper panels a double range of niches with figures about . high with canopies over them, all carved in cedar. The south door of Beauvais Cathedral is in some respects the finest in France; the upper panels are carved in high relief with figure subjects and canopies over them. The doors of the church at Gisors (1575) are carved with figures in niches subdivided by classic pilasters superimposed. In St. Maclou at
Rouen Rouen (, ; or ) is a city on the River Seine in northern France. It is the prefecture of the Regions of France, region of Normandy (administrative region), Normandy and the Departments of France, department of Seine-Maritime. Formerly one of ...
are three magnificently carved doors; those by Jean Goujon have figures in niches on each side, and others in a group of great beauty in the center. The other doors, probably about forty to fifty years later, are enriched with bas-reliefs, landscapes, figures and elaborate interlaced borders.
NASA The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeeding t ...
's
Vehicle Assembly Building The Vehicle Assembly Building (originally the Vertical Assembly Building), or VAB, is a large building at NASA's Kennedy Space Center (KSC), designed to assemble large pre-manufactured space vehicle components, such as the massive Saturn V and th ...
at the Kennedy Space Center contains the four largest doors. The Vehicle Assembly Building was originally built for the assembly of the
Apollo Apollo, grc, Ἀπόλλωνος, Apóllōnos, label=genitive , ; , grc-dor, Ἀπέλλων, Apéllōn, ; grc, Ἀπείλων, Apeílōn, label=Arcadocypriot Greek, ; grc-aeo, Ἄπλουν, Áploun, la, Apollō, la, Apollinis, label= ...
missions'
Saturn Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius of about nine and a half times that of Earth. It has only one-eighth the average density of Earth; h ...
vehicles and was then used to support Space Shuttle operations. Each of the four doors are 139 meters (456 feet) high. The oldest door in England can be found in
Westminster Abbey Westminster Abbey, formally titled the Collegiate Church of Saint Peter at Westminster, is an historic, mainly Gothic church in the City of Westminster, London, England, just to the west of the Palace of Westminster. It is one of the United ...
and dates from 1050. In England in the 17th century the door panels were raised with
bolection A bolection is a decorative moulding which projects beyond the face of a panel or frame in raised panel walls, doors, and fireplaces. It is commonly used when the meeting surfaces are at different levels, especially to hold floating panels in pl ...
or projecting moldings, sometimes richly carved, around them; in the 18th century the moldings worked on the stiles and rails were carved with the egg-and-dart
ornament An ornament is something used for decoration. Ornament may also refer to: Decoration * Ornament (art), any purely decorative element in architecture and the decorative arts * Biological ornament, a characteristic of animals that appear to serve ...
. File:Fragment from a tomb door MET 23.3.174f-emf.jpg, Fragment from an Ancient Egyptian tomb door, circa 2150 –1981 BC, in the
Metropolitan Museum of Art The Metropolitan Museum of Art of New York City, colloquially "the Met", is the largest art museum in the Americas. Its permanent collection contains over two million works, divided among 17 curatorial departments. The main building at 1000 ...
(New York City) File:The Hercules Sarcophagus depicting the Twelve Labors of Hercules, 150-160 AD, Kayseri Archaeological Museum, Turkey (26261172056) (lighter version).jpg,
Ancient Greek Ancient Greek includes the forms of the Greek language used in ancient Greece and the ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Dark Ages (), the Archaic peri ...
door carved on the Hercules sarcophagus from the
Kayseri Archaeology Museum Kayseri Archaeology Museum is a museum in Kayseri, Turkey. Kayseri Archeology Museum, which has been serving here for about 50 years, has been moved to the new museum building within the Kayseri Castle and has been opened to visitors since 19 Oct ...
(
Kayseri Kayseri (; el, Καισάρεια) is a large Industrialisation, industrialised List of cities in Turkey, city in Central Anatolia, Turkey, and the capital of Kayseri Province, Kayseri province. The Kayseri Metropolitan Municipality area is comp ...
, Turkey) File:Bronze door, Basilica di San Giovanni, 2013.jpg,
Ancient Roman In modern historiography, ancient Rome refers to Roman civilisation from the founding of the city of Rome in the 8th century BC to the collapse of the Western Roman Empire in the 5th century AD. It encompasses the Roman Kingdom (753–509 BC ...
bronze doors of the
Curia Julia The Curia Julia ( la, Curia Iulia, links=no, it, Curia Iulia, links=no) is the third named ''curia'', or senate house, in the ancient city of Rome. It was built in 44 BC, when Julius Caesar replaced Faustus Cornelius Sulla's reconstructed Curia ...
, now in the
Basilica of St. John Lateran The Archbasilica Cathedral of the Most Holy Savior and of Saints John the Baptist and John the Evangelist in the Lateran ( it, Arcibasilica del Santissimo Salvatore e dei Santi Giovanni Battista ed Evangelista in Laterano), also known as the Papa ...
(Rome) File:Gate, ash-Shibak Fort, Ibra (North ash-Sharqiyah Governorate) Origin- Surat, India (Mughal Empire) Teak wood and brass.jpg,
Indian Indian or Indians may refer to: Peoples South Asia * Indian people, people of Indian nationality, or people who have an Indian ancestor ** Non-resident Indian, a citizen of India who has temporarily emigrated to another country * South Asia ...
Mughal Mughal or Moghul may refer to: Related to the Mughal Empire * Mughal Empire of South Asia between the 16th and 19th centuries * Mughal dynasty * Mughal emperors * Mughal people, a social group of Central and South Asia * Mughal architecture * Mug ...
teak wood and brass door File:Tenghua Jiuguan 21 2015-04.JPG, Traditional
Chinese Chinese can refer to: * Something related to China * Chinese people, people of Chinese nationality, citizenship, and/or ethnicity **''Zhonghua minzu'', the supra-ethnic concept of the Chinese nation ** List of ethnic groups in China, people of va ...
folding doors in The Old Museum of Wisteria ( Changzhou, China) File:Lateral door church Theotokos Gorgoepikoos Athens, Greece.jpg,
Byzantine The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinopl ...
door of the
Little Metropolis The Little Metropolis ( el, Μικρή Μητρόπολη), formally the Church of St. Eleutherios () or Panagia Gorgoepikoos (, "Panagia Who Grants Requests Quickly"), is a Byzantine church located at the Mitropoleos Square (Cathedral of Athens), ...
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Athens Athens ( ; el, Αθήνα, Athína ; grc, Ἀθῆναι, Athênai (pl.) ) is both the capital and largest city of Greece. With a population close to four million, it is also the seventh largest city in the European Union. Athens dominates ...
, Greece) File:Door in Morocco, 2010.jpg,
Islamic Islam (; ar, ۘالِإسلَام, , ) is an Abrahamic monotheistic religion centred primarily around the Quran, a religious text considered by Muslims to be the direct word of God (or '' Allah'') as it was revealed to Muhammad, the mai ...
door decorated with
geometric patterns A pattern is a regularity in the world, in human-made design, or in abstract ideas. As such, the elements of a pattern repeat in a predictable manner. A geometric pattern is a kind of pattern formed of geometric shapes and typically repeated l ...
in
Morocco Morocco (),, ) officially the Kingdom of Morocco, is the westernmost country in the Maghreb region of North Africa. It overlooks the Mediterranean Sea to the north and the Atlantic Ocean to the west, and has land borders with Algeria to ...
File:'Berfrestone' (DB) door and tympanum arch St Nicholas Church Barfrestone Kent England 1.jpg, Romanesque door of the Saint Nicholas' Church in
Barfrestone Barfrestone is a village in East Kent, England, and between Shepherdswell, Eythorne and Nonington, and close to the pit villages of Elvington and Snowdown. Alternative spellings are Barfreston and Barfreystone. The old pronunciation was "Barson ...
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Kent Kent is a county in South East England and one of the home counties. It borders Greater London to the north-west, Surrey to the west and East Sussex to the south-west, and Essex to the north across the estuary of the River Thames; it faces ...
, England) File:Doorway detail, St Magnus Cathedral, Kirkwall, Orkney.jpg,
Gothic Gothic or Gothics may refer to: People and languages *Goths or Gothic people, the ethnonym of a group of East Germanic tribes **Gothic language, an extinct East Germanic language spoken by the Goths **Crimean Gothic, the Gothic language spoken b ...
door of the St Magnus Cathedral ( Kirkwall, Scotland) File:Iconography - Saint Basil's Cathedral (19970306871).jpg, Russian door in
Saint Basil's Cathedral The Cathedral of Vasily the Blessed ( rus, Собо́р Васи́лия Блаже́нного, Sobór Vasíliya Blazhénnogo), commonly known as Saint Basil's Cathedral, is an Orthodox church in Red Square of Moscow, and is one of the most pop ...
(Moscow) File:The entrance of the Antim Monastery Church.jpg, Brâncovenesc door of the Antim Monastery (
Bucharest Bucharest ( , ; ro, București ) is the capital and largest city of Romania, as well as its cultural, industrial, and financial centre. It is located in the southeast of the country, on the banks of the Dâmbovița River, less than north of ...
, Romania), with a
pisanie A pisanie is an architectural elements, that consists of an inscription carved in stone, wood, metal, painted, etc., on the top of tombs or above the main door at the entrance in a church, in which are recorded information about the church, the don ...
above it File:Gdańsk (158).JPG,
Renaissance The Renaissance ( , ) , from , with the same meanings. is a period in European history marking the transition from the Middle Ages to modernity and covering the 15th and 16th centuries, characterized by an effort to revive and surpass ideas ...
door in
Gdańsk Gdańsk ( , also ; ; csb, Gduńsk;Stefan Ramułt, ''Słownik języka pomorskiego, czyli kaszubskiego'', Kraków 1893, Gdańsk 2003, ISBN 83-87408-64-6. , Johann Georg Theodor Grässe, ''Orbis latinus oder Verzeichniss der lateinischen Benen ...
(Poland) File:Chateau de Versailles Vestibule Haut 11 (lighter and fixed angles).jpg,
Baroque The Baroque (, ; ) is a style of architecture, music, dance, painting, sculpture, poetry, and other arts that flourished in Europe from the early 17th century until the 1750s. In the territories of the Spanish and Portuguese empires including t ...
door in the
Palace of Versailles The Palace of Versailles ( ; french: Château de Versailles ) is a former royal residence built by King Louis XIV located in Versailles, Yvelines, Versailles, about west of Paris, France. The palace is owned by the French Republic and since 19 ...
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Versailles The Palace of Versailles ( ; french: Château de Versailles ) is a former royal residence built by King Louis XIV located in Versailles, about west of Paris, France. The palace is owned by the French Republic and since 1995 has been managed, u ...
, France) File:Porte rue Monsieur-le-Prince Paris.jpg,
Rococo Rococo (, also ), less commonly Roccoco or Late Baroque, is an exceptionally ornamental and theatrical style of architecture, art and decoration which combines asymmetry, scrolling curves, gilding, white and pastel colours, sculpted moulding, ...
door on Rue Monsieur-le-Prince (Paris) File:P1210063 Paris III rue des Francs-Bourgeois n26 rwk.jpg,
Louis XVI Louis XVI (''Louis-Auguste''; ; 23 August 175421 January 1793) was the last King of France before the fall of the monarchy during the French Revolution. He was referred to as ''Citizen Louis Capet'' during the four months just before he was ...
door of the Hôtel Mortier de Sandreville, on Rue des Francs-Bourgeois (Paris) File:Pierre Rousseau - Double-Leaf Doors - 1942.2.12 - Cleveland Museum of Art.tif, Neoclassical painted double-leaf door, 1790s, by
Pierre Rousseau Pierre Jean-Baptiste Rousseau (11 February 1905 – 1983) was a French essayist, epistemologist, astronomer and journalist who authored numerous popular science essays and articles. He helped promote hard science to the general public and advocat ...
, in the Cleveland Museum of Art (US) File:Brooklyn Museum 1994.92 Door with Lock (2).jpg,
African African or Africans may refer to: * Anything from or pertaining to the continent of Africa: ** People who are native to Africa, descendants of natives of Africa, or individuals who trace their ancestry to indigenous inhabitants of Africa *** Ethn ...
door with lock, late 19th or early 20th century, wood with iron, from
Burkina Faso Burkina Faso (, ; , ff, 𞤄𞤵𞤪𞤳𞤭𞤲𞤢 𞤊𞤢𞤧𞤮, italic=no) is a landlocked country in West Africa with an area of , bordered by Mali to the northwest, Niger to the northeast, Benin to the southeast, Togo and Ghana to the ...
, in the
Brooklyn Museum The Brooklyn Museum is an art museum located in the New York City borough of Brooklyn. At , the museum is New York City's second largest and contains an art collection with around 1.5 million objects. Located near the Prospect Heights, Crown H ...
(New York City) File:Zespół klasztoru Gandan (39).jpg, A decorated door from the
Gandantegchinlen Monastery The Gandantegchinlen Monastery ( mn, Гандантэгчинлэн хийд, ''Gandantegchinlen khiid'', short name: Gandan mn, Гандан) is a Mongolian Buddhist monastery in the Mongolian capital of Ulaanbaatar that has been restored and r ...
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Mongolia Mongolia; Mongolian script: , , ; lit. "Mongol Nation" or "State of Mongolia" () is a landlocked country in East Asia, bordered by Russia to the north and China to the south. It covers an area of , with a population of just 3.3 million, ...
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Gothic Revival Gothic Revival (also referred to as Victorian Gothic, neo-Gothic, or Gothick) is an architectural movement that began in the late 1740s in England. The movement gained momentum and expanded in the first half of the 19th century, as increasingly ...
door on Rue Malebranche (Paris) File:Egyptian Revival mausoleum, Forest Home Cemetery.jpg, Egyptian Revival door of a mausoleum in the Forest Home Cemetery (
Wisconsin Wisconsin () is a state in the upper Midwestern United States. Wisconsin is the 25th-largest state by total area and the 20th-most populous. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake M ...
, US) File:Armoiries de lIrlande à lambassade dIrlande à Paris.jpg, Rococo Revival door of the
Hôtel de Breteuil The Hôtel de Breteuil is a historic building in the 16th arrondissement of Paris, France. History The hôtel particulier was built for Henri Le Tonnelier de Breteuil and his second wife. It was designed by architect Ernest Sanson, and its constru ...
(Paris) File:3-5, Strada Icoanei, Bucharest (Romania) 1.jpg, Romanian Revival door of the
Școala Centrală National College Școala Centrală National College ( ro, Colegiul Național Școala Centrală; literally, “Central School”) is an institution of primary, secondary, and upper secondary education in Bucharest, Romania which functioned along the passing of time ...
on Strada Icoanei (Bucharest) File:Paris Porte cochère rue La Bruyère 2012.jpg, 19th century
Eclectic Eclectic may refer to: Music * ''Eclectic'' (Eric Johnson and Mike Stern album), 2014 * ''Eclectic'' (Big Country album), 1996 * Eclectic Method, name of an audio-visual remix act * Eclecticism in music, the conscious use of styles alien to th ...
Classicist door on Rue La Bruyère (Paris) File:Entrance of the George Enescu Museum.jpg, Beaux-Arts door of the
Cantacuzino Palace Cantacuzino Palace is located on Calea Victoriei no. 141, Bucharest, Romania. It was built by architect Ion D. Berindey in the Beaux Arts style, having a few Rococo Revival rooms. Today it houses the George Enescu museum. History The palace ...
(Bucharest) File:Porte et marquise CCI Nancy.jpg,
Art Nouveau Art Nouveau (; ) is an international style of art, architecture, and applied art, especially the decorative arts. The style is known by different names in different languages: in German, in Italian, in Catalan, and also known as the Modern ...
metal and glass door in Nancy (France), with a big transparent
awning An awning or overhang is a secondary covering attached to the exterior wall of a building. It is typically composed of canvas woven of acrylic, cotton or polyester yarn, or vinyl laminated to polyester fabric that is stretched tightly over a lig ...
above it File:49-53, Calea Victoriei, Bucharest (Romania) 10.jpg, Stripped Classicist door of the Royal Palace of Bucharest, now the National Museum of Art of Romania File:La Maison Bleue, porte d'entrée - Angers - 20110119.jpg,
Art Deco Art Deco, short for the French ''Arts Décoratifs'', and sometimes just called Deco, is a style of visual arts, architecture, and product design, that first appeared in France in the 1910s (just before World War I), and flourished in the Unite ...
door in Angers (France)


Design and styles

There are many kinds of doors, with different purposes. The most common type is the single-leaf door, which consists of a single rigid panel that fills the doorway. There are many variations on this basic design, such as the double-leaf door or double door and French windows, which have two adjacent independent panels hinged on each side of the doorway. * A half door or
Dutch door A Dutch door (American English), stable door (British English), or half door (Hiberno-English), is a door divided in such a fashion that the bottom half may remain shut while the top half opens. They were known in early New England as double-hung d ...
or stable door is divided in half horizontally. Traditionally the top half opens so a worker can feed a
horse The horse (''Equus ferus caballus'') is a domesticated, one-toed, hoofed mammal. It belongs to the taxonomic family Equidae and is one of two extant subspecies of ''Equus ferus''. The horse has evolved over the past 45 to 55 million y ...
or other animal while the bottom half remains closed to keep the animal inside. This style of door has been adapted for homes. * Saloon doors are a pair of lightweight swing doors often found in public bars, and especially associated with the American west. Saloon doors, also known as
cafe A coffeehouse, coffee shop, or café is an establishment that primarily serves coffee of various types, notably espresso, latte, and cappuccino. Some coffeehouses may serve cold drinks, such as iced coffee and iced tea, as well as other non-caf ...
doors, often use bidirectional
hinge A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation: all other ...
s that close the door regardless of which direction it opens by incorporating springs. Saloon doors that only extend from knee-level to chest-level are known as batwing doors. * A blind door, Gibb door, or jib door has no visible trim or operable components. It blends with the adjacent wall in all finishes, to appear as part of the wall—a disguised door. * A French door consists of a frame around one or more transparent or translucent panels (called lights or lites) that may be installed singly, in matching pairs, or even as series. A matching pair of these doors is called a French window, as it resembles a door-height
casement window A casement window is a window that is attached to its frame by one or more hinges at the side. They are used singly or in pairs within a common frame, in which case they are hinged on the outside. Casement windows are often held open using a cas ...
. When a pair of French doors is used as a French window, the application does not generally include a central
mullion A mullion is a vertical element that forms a division between units of a window or screen, or is used decoratively. It is also often used as a division between double doors. When dividing adjacent window units its primary purpose is a rigid supp ...
(as do some casement window pairs), thus allowing a wider unobstructed opening. The frame typically requires a weather strip at floor level and where the doors meet to prevent water ingress. An
espagnolette An espagnolette is a locking device, normally mounted on the vertical frame of a French door or casement window. A handle or knob is connected to a metal rod mounted to the surface of the frame, about a metre above the floor. Operating the handle ...
bolt may let the head and foot of each door be secured in one movement. The slender window joinery maximizes light into the room and minimizes the visual impact of the doorway joinery when considered externally. The doors of a French window often open outward onto a balconet, balcony, porch, or terrace and they may provide an entrance to a garden. * A
louvered door A louver (American English) or louvre (British English; see spelling differences) is a window blind or shutter with horizontal slats that are angled to admit light and air, but to keep out rain and direct sunshine. The angle of the slats ...
has fixed or movable wooden fins (often called slats or
louver A louver (American English) or louvre (British English British English (BrE, en-GB, or BE) is, according to Lexico, Oxford Dictionaries, "English language, English as used in Great Britain, as distinct from that used elsewhere". Mor ...
s) which permit open ventilation while preserving privacy and preventing the passage of light to the interior. Being relatively weak structures, they are most commonly used for wardrobes and drying rooms, where security is of less importance than good ventilation, although a very similar structure is commonly used to form window shutters. Double louvred doors were introduced into '' Seagate'', built in
Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and to ...
in 1929 by Gwendolyn and Powel Crosley, that provided the desired circulation of air with an added degree of privacy in that it is impossible to see through the fins in any direction. * A composite door is a single leaf door that can be solid or with glass, and is usually filled with high density foam. In the United Kingdom, composite doors are commonly certified to BS PAS 23/24 and be compliant with Secured by Design, an official UK police initiative. * A steel security door is one which is made from strong steel, often for use on vaults and
safe room A safe room or panic room is a fortified room that is installed in a private residence or business to provide a safe shelter, or hiding place, for the inhabitants in the event of a break in, home invasion, tornado, terror attack, or other thr ...
s to withstand attack. These may also be fitted with wooden outer panels to resemble standard internal and external doors. * A flush door is a completely smooth door, having
plywood Plywood is a material manufactured from thin layers or "plies" of wood veneer that are glued together with adjacent layers having their wood grain rotated up to 90 degrees to one another. It is an engineered wood from the family of manufactured ...
or MDF fixed over a light timber frame, the hollow parts of which are often filled with a cardboard core material. Skins can also be made out of hardboards, the first of which was invented by William H Mason in 1924. Called Masonite, its construction involved pressing and steaming wood chips into boards. Flush doors are most commonly employed in the interior of a dwelling, although slightly more substantial versions are occasionally used as exterior doors, especially within hotels and other buildings containing many independent dwellings. * A moulded door has the same structure as that of flush door. The only difference is that the surface material is a moulded skin made of MDF. Skins can also be made out of hardboards. * A ledge and brace door often called board and batten doors are made from multiple vertical boards fixed together by two or more horizontal timbers called ledges (or battens)and sometimes kept square by additional diagonal timbers called braces. * A wicket door is a pedestrian door built into a much larger door allowing access without requiring the opening of the larger door. Examples might be found on the ceremonial door of a cathedral or in a large vehicle door in a garage or hangar. * A bifold door is a unit that has several sections, folding in pairs. Wood is the most common material, and doors may also be metal or glass. Bifolds are most commonly made for closets, but may also be used as units between rooms. Bi-fold doors are essentially now doors that let the outside in. They open in concert; where the panels fold up against one another and are pushed together when opened. The main door panel (often known as the traffic door) is accompanied by a stack of panels that fold very neatly against one another when opened fully, which almost look like room dividers. * A sliding glass door, sometimes called an Arcadia door or patio door, is a door made of
glass Glass is a non-crystalline, often transparent, amorphous solid that has widespread practical, technological, and decorative use in, for example, window panes, tableware, and optics. Glass is most often formed by rapid cooling (quenching) of ...
that slides open and sometimes has a screen (a removable metal mesh that covers the door). * Australian doors are a pair of plywood swinging doors often found in Australian public houses. These doors are generally red or brown in color and bear a resemblance to the more formal doors found in other British Colonies' public houses. * A false door is a wall decoration with the appearance of a window. In ancient Egyptian architecture, this was a common element in a tomb, the false door representing a gate to the afterlife. They can also be found in the funerary architecture of the desert tribes (e.g.,
Libya Libya (; ar, ليبيا, Lībiyā), officially the State of Libya ( ar, دولة ليبيا, Dawlat Lībiyā), is a country in the Maghreb region in North Africa. It is bordered by the Mediterranean Sea to the north, Egypt to Egypt–Libya bo ...
n Ghirza). * A doormat (also called door mat) is a mat placed typically in front of or behind a door of a home. This practice originated so that mud and dirt would be less prevalent on floors inside a building.


Types


Hinged

Most doors are
hinge A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation: all other ...
d along one side to allow the door to pivot away from the doorway in one direction, but not the other. The axis of rotation is usually vertical. In some cases, such as hinged
garage door A garage door is a large door on a garage that opens either manually or by an electric motor (a garage door opener). Garage doors are frequently large enough to accommodate automobiles and other vehicles. Small garage doors may be made in a sing ...
s, the axis may be horizontal, above the door opening. Doors can be hinged so that the axis of rotation is not in the plane of the door to reduce the space required on the side to which the door opens. This requires a mechanism so that the axis of rotation is on the side other than that in which the door opens. This is sometimes the case in trains or airplanes, such as for the door to the toilet, which opens inward. A swing door has special single-action hinges that allow it to open either outward or inward, and is usually sprung to keep it closed. French doors are derived from the French design called the casement door. It is a door with lites where all or some panels would be in a casement door. A French door traditionally has a moulded panel at the bottom of the door. It is called a French window when used in a pair as double-leaved doors with large glass panels in each door leaf, and in which the doors may swing out (typically) as well as in. A double-acting door, patented in 1880 by the Dutch-American engineer Lorenz Bommer, swings both ways. They are often used in areas where many people are likely to pass through, such as restaurant kitchens. A Dutch door or stable door consists of two halves. The top half operates independently from the bottom half. A variant exists in which opening the top part separately is possible, but because the lower part has a lip on the inside, closing the top part, while leaving the lower part open, is not. A garden door resembles a French window (with lites), but is more secure because only one door is operable. The hinge of the operating door is next to the adjacent fixed door and the latch is located at the wall opening jamb rather than between the two doors or with the use of an
espagnolette An espagnolette is a locking device, normally mounted on the vertical frame of a French door or casement window. A handle or knob is connected to a metal rod mounted to the surface of the frame, about a metre above the floor. Operating the handle ...
bolt.


Sliding

It is often useful to have doors which slide along tracks, often for space or aesthetic considerations. A bypass door is a door unit that has two or more sections. The doors can slide in either direction along one axis on parallel overhead tracks, sliding past each other. They are most commonly used in closets to provide access one side of the closet at a time. Doors in a bypass unit overlap slightly when viewed from the front so they don't have a visible gap when closed. Doors which slide inside a wall cavity are called
pocket door A pocket door is a sliding door that, when fully open, disappears into a compartment in the adjacent wall. Pocket doors are used for architecture, architectural effect, or when there is no room for the swing of a hinged door. They can travel on r ...
s. This type of door is used in tight spaces where privacy is also required. The door slab is mounted to roller and a track at the top of the door and slides inside a wall. Sliding glass doors are common in many houses, particularly as an entrance to the backyard. Such doors are also popular for use for the entrances to commercial structures, although they are not counted as fire exit doors. The door that moves is called the "active leaf", while the door that remains fixed is called the "inactive leaf".


Rotating

A
revolving door A revolving door typically consists of three or four doors that hang on a central shaft and rotate around a vertical axis within a cylindrical enclosure. Revolving doors are energy efficient as they, acting as an airlock, prevent drafts, thus de ...
has several wings or leaves, generally four, radiating from a central shaft, forming compartments that rotate about a vertical axis. A revolving door allows people to pass in both directions without colliding, and forms an airlock maintaining a seal between inside and out. A pivot door, instead of hinges, is supported on a bearing some distance away from the edge, so that there is more or less of a gap on the pivot side as well as the opening side. In some cases the pivot is central, creating two equal openings.


High-speed

A
high-speed door High-speed doors are door systems, mainly used in industrial applications. They are technical enhancements of the generally known sectional doors, PVC fabric doors or roller shutters. The main difference is that the durable construction provide ...
is a very fast door some with opening speeds of up to 4 m/s, mainly used in the industrial sector where the speed of a door has an effect on production logistics, temperature and pressure control. High-speed cleanroom doors, usually consisting of a transparent material on a stainless steel frame, are used in pharmaceutical industries to allow passage between work areas while admitting minimal contaminants. The powerful high-speed doors have a smooth surface structure and no protruding edges, allowing minimal particle retention and easy cleaning. High-speed doors are made to handle a high number of openings, generally more than 200,000 a year. They must be built with heavy-duty parts and counterbalance systems for speed enhancement and emergency opening function. The door curtain was originally made of PVC, but was later also developed in aluminium and acrylic glass sections. High-speed refrigeration and cold-room doors with excellent insulation values have also been introduced for
green Green is the color between cyan and yellow on the visible spectrum. It is evoked by light which has a dominant wavelength of roughly 495570 Nanometre, nm. In subtractive color systems, used in painting and color printing, it is created by ...
and energy-saving requirements. In North America, the Door and Access Systems Manufacturing Association (DASMA) defines high-performance doors as non-residential powered doors characterized by rolling, folding, sliding or swinging action, that are either high-cycle (minimum 100 cycles/day) or high-speed (minimum 20 inches (508 mm)/second), and two out of three of the following: made-to-order for exact size and custom features, able to withstand equipment impact (break-away if accidentally hit by vehicle), or able to sustain heavy use with minimal maintenance.


Automatic

Automatically opening doors are powered open and closed either by electricity, spring, or both. There are several methods by which an automatically opening door is activated: # A
sensor A sensor is a device that produces an output signal for the purpose of sensing a physical phenomenon. In the broadest definition, a sensor is a device, module, machine, or subsystem that detects events or changes in its environment and sends ...
detects traffic is approaching. Sensors for automatic doors are generally: #* A
pressure sensor A pressure sensor is a device for pressure measurement of gases or liquids. Pressure is an expression of the force required to stop a fluid from expanding, and is usually stated in terms of force per unit area. A pressure sensor usually act ...
– e.g., a floor mat which reacts to the pressure of someone standing on it. #* An
infrared Infrared (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with wavelengths longer than those of visible light. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from around ...
curtain or beam which shines invisible light onto sensors; if someone or something blocks the beam the door is triggered open. #* A motion sensor which uses low-power microwave
radar Radar is a detection system that uses radio waves to determine the distance (''ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, w ...
for the same effect. #* A remote sensor (e.g. based on infrared or radio waves) can be triggered by a portable
remote control In electronics, a remote control (also known as a remote or clicker) is an electronic device used to operate another device from a distance, usually wirelessly. In consumer electronics, a remote control can be used to operate devices such as ...
, or is installed inside a vehicle. These are popular for garage doors. # A switch is operated manually, perhaps after security checks. This can be a push button switch or a swipe card. # The act of pushing or pulling the door triggers the open and close cycle. These are also known as power-assisted doors. In addition to activation sensors, automatically opening doors are generally fitted with safety sensors. These are usually an infrared curtain or beam, but can be a pressure mat fitted on the swing side of the door. The safety sensor prevents the door from colliding with an object by stopping or slowing its motion. A mechanism in modern automatic doors ensures that the door can open in a power failure.


Other

Up-and-over or overhead doors are often used in garages. Instead of hinges, it has a mechanism, often
counterbalance A counterweight is a weight that, by applying an opposite force, provides balance and stability of a mechanical system. The purpose of a counterweight is to make lifting the load faster and more efficient, which saves energy and causes less wear ...
d or sprung, so it can lift and rest horizontally above the opening. A
roller shutter A roller shutter, security shutter, coiling door, roller door or sectional overhead door is a type of door or window shutter consisting of many horizontal slats (or sometimes bars or web systems) hinged together. The door is raised to open it ...
or sectional overhead door is one variant of this type. A
tambour door A tambour door A door is a hinged or otherwise movable barrier that allows ingress (entry) into and egress (exit) from an enclosure. The created opening in the wall is a ''doorway'' or ''portal''. A door's essential and primary purpose is to ...
or roller door is an up-and-over door made of narrow horizontal slats that rolls up and down by sliding along vertical tracks; it is typically found in entertainment centres and cabinets. Rebated doors, a term chiefly used in Britain, are double doors with a lip or overlap (i.e. a rabbet) on the vertical edge(s) where they meet. Fire-rating can be achieved with an applied edge-guard or astragal molding on the meeting stile, in accordance with the American
fire door A fire door is a door with a fire-resistance rating (sometimes referred to as a ''fire protection rating'' for closures) used as part of a passive fire protection system to reduce the spread of fire and smoke between separate compartments of ...
. Evolution Door is a trackless door that moves in the same closure level as a sliding door. Invented by Austrian artist Klemens Torggler, is a further development of the that normally consists of two rotatable, connected panels which move to each other when opening.


Applications

Architectural doors have numerous general and specialized uses. Doors are generally used to separate interior spaces (closets, rooms, etc.) for convenience,
privacy Privacy (, ) is the ability of an individual or group to seclude themselves or information about themselves, and thereby express themselves selectively. The domain of privacy partially overlaps with security, which can include the concepts of a ...
,
safety Safety is the state of being "safe", the condition of being protected from harm or other danger. Safety can also refer to risk management, the control of recognized hazards in order to achieve an acceptable level of risk. Meanings There are ...
, and
security Security is protection from, or resilience against, potential harm (or other unwanted coercive change) caused by others, by restraining the freedom of others to act. Beneficiaries (technically referents) of security may be of persons and social ...
reasons. Doors are also used to secure passages into a building from the exterior, for reasons of
climate Climate is the long-term weather pattern in an area, typically averaged over 30 years. More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years. Some of the meteorologic ...
control and safety. Doors also are applied in more specialized cases: * A blast-proof door is constructed to allow access to a structure as well as to provide protection from the force of explosions. * A garden door is any door that opens to a backyard or
garden A garden is a planned space, usually outdoors, set aside for the cultivation, display, and enjoyment of plants and other forms of nature. The single feature identifying even the wildest wild garden is ''control''. The garden can incorporate both ...
. This term is often used specifically for French windows, double French doors (with lites instead of panels), in place of a sliding glass door. The term also may refer to what is known as ''patio doors''. * A jib door is a concealed door, whose surface reflects the moldings and finishes of the wall. These were used in historic English houses, mainly as servants' doors. * A
pet door A pet door or pet flap (also referred to in more specific terms, such as cat flap, cat door, kitty door, dog flap, dog door, or doggy/doggie door) is a small opening to allow pets to enter and exit a building on their own without needing a human t ...
(also known as a
cat flap A pet door or pet flap (also referred to in more specific terms, such as cat flap, cat door, kitty door, dog flap, dog door, or doggy/doggie door) is a small opening to allow pets to enter and exit a building on their own without needing a human t ...
or dog door) is an opening in a door to allow pets to enter and exit without the main door's being opened. It may be simply covered by a
rubber Rubber, also called India rubber, latex, Amazonian rubber, ''caucho'', or ''caoutchouc'', as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds. Thailand, Malaysia, and ...
flap, or it may be an actual door hinged on the top that the pet can push through. Pet doors may be mounted in a sliding glass door as a new (permanent or temporary) panel. Pet doors may be unidirectional, only allowing pets to exit. Additionally, pet doors may be electronic, only allowing animals with a special electronic tag to enter. * A trapdoor is a door that is oriented horizontally in a
ceiling A ceiling is an overhead interior surface that covers the upper limits of a room. It is not generally considered a structural element, but a finished surface concealing the underside of the roof structure or the floor of a story above. Ceilings ...
or
floor A floor is the bottom surface of a room or vehicle. Floors vary from simple dirt in a cave to many layered surfaces made with modern technology. Floors may be stone, wood, bamboo, metal or any other material that can support the expected load ...
, often accessed via a
ladder A ladder is a vertical or inclined set of rungs or steps used for climbing or descending. There are two types: rigid ladders that are self-supporting or that may be leaned against a vertical surface such as a wall, and rollable ladders, such a ...
. * A water door or water entrance, such as those used in
Venice, Italy Venice ( ; it, Venezia ; vec, Venesia or ) is a city in northeastern Italy and the capital of the Veneto region. It is built on a group of 118 small islands that are separated by canals and linked by over 400 bridges. The islan ...
, is a door leading from a building built on the water, such as a canal, to the water itself where, for example, one may enter or exit a private boat or
water taxi A water taxi or a water bus is a watercraft used to provide public or private transport, usually, but not always, in an urban environment. Service may be scheduled with multiple stops, operating in a similar manner to a bus, or o ...
.


Construction and components


Paneling

Panel doors, also called stile and rail doors, are built with
frame and panel Frame and panel construction, also called rail and stile, is a woodworking technique often used in the making of doors, wainscoting, and other decorative features for cabinets, furniture, and homes. The basic idea is to capture a 'floating' panel ...
construction. EN 12519 is describing the terms which are officially used in European Member States. The main parts are listed below: * Stiles – Vertical boards that run the full height of a door and compose its right and left edges. The hinges are mounted to the fixed side (known as the "hanging stile"), and the handle, lock, bolt or latch are mounted on the swinging side (known as the "latch stile"). * Rails – Horizontal boards at the top, bottom, and optionally in the middle of a door that join the two stiles and split the door into two or more rows of panels. The "top rail" and "bottom rail" are named for their positions. The bottom rail is also known as "kick rail". A middle rail at the height of the bolt is known as the "lock rail", other middle rails are commonly known as "cross rails". *
Mullion A mullion is a vertical element that forms a division between units of a window or screen, or is used decoratively. It is also often used as a division between double doors. When dividing adjacent window units its primary purpose is a rigid supp ...
s – Smaller optional vertical boards that run between two rails, and split the door into two or more columns of panels, the term is used sometimes for verticals in doors, but more often (UK and Australia) it refers to verticals in windows. * Muntin – Optional vertical members that divide the door into smaller panels. * Panels – Large, wider boards used to fill the space between the stiles, rails, and mullions. The panels typically fit into grooves in the other pieces, and help to keep the door rigid. Panels may be flat, or in raised panel designs. Can be glued in or stay as a floating panel. * Light – a piece of glass used in place of a panel, essentially giving the door a window.


Board battening

Also known as ledges and braced, board and batten doors are an older design consisting primarily of vertical slats: * Planks – Boards wider than 9" that extend the full height of the door, and are placed side by side filling the door's width. * Ledges and braces – Ledges extend horizontally across the door which the boards are affixed to. The ledges hold the planks together. When diagonally they are called braces which prevent the door from skewing. On some doors, especially antique ones, the ledges are replaced with iron bars that are often built into the hinges as extensions of the door-side plates.


Ledging and bracing

As board and Batten doors.


Impact resistance

Impact-resistant doors have rounded stile edges to dissipate energy and minimize edge chipping, scratching and denting. The formed edges are often made of an engineered material. Impact-resistant doors excel in high traffic areas such as hospitals, schools, hotels and coastal areas.


Frame and fill

This type consists of a solid timber frame, filled on one face, face with tongue and groove boards. Quite often used externally with the boards on the weather face.


Flushing

Flushing of a door means the door is flush with the face of the wall on either side.


Moulding

* Stiles and rails – As above, but usually smaller. They form the outside edges of the door. * Core material: Material within the door used simply to fill space, provide rigidity and reduce druminess. ** Hollow-core – Often consists of a lattice or honeycomb made of
corrugated cardboard Corrugated fiberboard or corrugated cardboard is a type of packaging material consisting of a fluted corrugated sheet and one or two flat linerboards. It is made on "flute lamination machines" or "corrugators" and is used for making corrugated ...
, extruded polystyrene foam, or thin wooden slats. Can also be built with staggered wooden blocks. Hollow-core molded doors are commonly used as interior doors. *** Lock block – A solid block of wood mounted within a hollow-core flush door near the bolt to provide a solid and stable location for mounting the door's hardware. ** Stave-core – Consists of wooden slats stacked upon one another in a manner similar to a board & batten door (though the slats are usually thinner) or the wooden-block hollow-core (except that the space is entirely filled). ** Solid-core – Can consist of low-density particle board or foam used to completely fill the space within the door. Solid-core flush doors (especially foam-core ones) are commonly used as exterior doors because they provide more
insulation Insulation may refer to: Thermal * Thermal insulation, use of materials to reduce rates of heat transfer ** List of insulation materials ** Building insulation, thermal insulation added to buildings for comfort and energy efficiency *** Insulated ...
and strength. * Skin – The front and back faces of the door are covered with HDF/ MDF skins.


Swing direction

Generally, door swings, or handing, are determined while standing on the outside or less secure side of the door while facing the door (i.e., standing on the side requiring a key to open, going from outside to inside, or from public to private). It is important to get the hand and swing correct on exterior doors, as the transom is usually sloped and sealed to resist water entry, and properly drain. In some custom millwork (or with some master carpenters), the manufacture or installer bevels the leading edge (the first edge to meet the jamb as the door closes) so that the door fits tight without binding. Specifying an incorrect hand or swing can make the door bind, not close properly, or leak. Fixing this error is expensive or time-consuming. In North America, many doors now come with factory-installed hinges, pre-hung on the jamb and sills. While facing the door from the outside or less secure side, if the hinge is on the right side of the door, the door is "right handed"; or if the hinge is on the left, it is "left handed". If the door swings toward you, it is "reverse swing"; or if the door swings away from you, it is "normal swing". In other words: *In the United States: ** Left hand hinge (LHH): Standing outside (or on the less secure side, or on the public side of the door), the hinges are on the left and the door opens in (away from you). ** Right hand hinge (RHH): Standing outside (or on the less secure side), the hinges are on the right and the door opens in (away from you). ** Left hand reverse (LHR): Standing outside the house (or on the less secure side), the hinges are on the left, knob on right, on opening the door it swings toward you (i.e. the door swings open toward the outside, or "outswing") ** Right hand reverse (RHR): Standing outside the house (i.e. on the less secure side), the hinges are on the right, knob on left, opening the door by pulling the door toward you (i.e. open swings to the outside, or "outswing") *In Europe: ** One of the oldest
DIN DIN or Din or din may refer to: People and language * Din (name), people with the name * Dīn, an Arabic word with three general senses: judgment, custom, and religion from which the name originates * Dinka language (ISO 639 code: din), spoken by ...
standard applies: DIN 107 "Building construction; identification of right and left side" (first 1922–05, current 1974–04) defines that doors are categorized from the side where the door hinges can be seen. If the hinges are on the left, it is a DIN Left door (DIN links, DIN gauche), if the hinges are on the right, it is a DIN Right door (DIN rechts, DIN droite). The DIN Right and DIN Left marking are also used to categorize matching installation material such as mortise locks (referenced in DIN 107). The European Standard DIN EN 12519 "Windows and pedestrian doors. Terminology" includes these definitions of orientation. * In Australia: ** The "refrigerator rule" applies, and a refrigerator door is not opened from the inside. If the hinges are on the right then it is a right hand (or right hung) door. (Australian Standards for Installation of Timber Doorsets, AS 1909–1984 pg 6.) ** In public buildings, exterior doors open to the outside to comply with applicable fire codes. In a fire, a door that opens inward could cause a crush of people who can't open it.


Main materials

New exterior doors are largely defined by the type of materials they are made from:
wood Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody plants. It is an organic materiala natural composite of cellulose fibers that are strong in tension and embedded in a matrix of lignin th ...
,
steel Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant ty ...
,
fiberglass Fiberglass (American English) or fibreglass (Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass cloth ...
, UPVC/vinyl,
aluminum Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It has ...
, composite, glass (patio doors), etc. Wooden doors – including solid wood doors – are a top choice for many homeowners, largely because of the aesthetic qualities of wood. Many wood doors are custom-made, but they have several downsides: their price, their maintenance requirements (regular painting and staining) and their limited insulating value (R-5 to R-6, not including the effects of the glass elements of the doors). Wood doors often have an overhang requirement to maintain a warranty. An overhang is a roof, porch area or awning that helps to protect the door and its finish from UV rays. Steel doors are another major type of residential front doors; most of them come with a polyurethane or other type of foam insulation core – a critical factor in a building's overall comfort and efficiency. Steel doors mostly in default comes along with frame and lock system, which is a high cost efficiency factor compared to wooden doors. Most modern exterior walls provide
thermal insulation Thermal insulation is the reduction of heat transfer (i.e., the transfer of thermal energy between objects of differing temperature) between objects in thermal contact or in range of radiative influence. Thermal insulation can be achieved with s ...
and
energy efficiency Energy efficiency may refer to: * Energy efficiency (physics), the ratio between the useful output and input of an energy conversion process ** Electrical efficiency, useful power output per electrical power consumed ** Mechanical efficiency, a ra ...
, which can be indicated by the Energy Star label or the Passive House standards. Premium composite (including steel doors with a thick core of polyurethane or other foam), fiberglass and vinyl doors benefit from the materials they are made from, from a thermal perspective.


Insulation and weatherstripping

But there are very few door models with an R-value close to 10 (the R-value measures how well a barrier resists the conductive flow of heat). This is far less than the R-40 walls or the R-50 ceilings of super-insulated buildings – Passive Solar and Zero Energy Buildings. Typical doors are not thick enough to provide very high levels of energy efficiency. Many doors may have good R-values at their center, but their overall energy efficiency is reduced because of the presence of glass and reinforcing elements, or because of poor weatherstripping and the way the door is manufactured. Door weatherstripping is particularly important for energy efficiency. German-made passive house doors use multiple weatherstrips, including magnetic strips, to meet higher standards. These weatherstrips reduce energy losses due to air leakage.


Dimensions


United States

Standard door sizes in the US run along 2" increments. Customary sizes have a height of 78" (1981 mm) or 80" (2032 mm) and a width of 18" (472 mm), 24" (610 mm), 26" (660 mm), 28" (711 mm), 30" (762 mm) or 36" (914 mm). Most residential passage (room to room) doors are 30" x 80" (762 mm × 2032 mm). A standard US residential (exterior) door size is 36" × 80" (91 × 2032 mm). Interior doors for wheelchair access must also have a minimum width of 36" (914 mm). Residential interior doors, as well as the doors of many small stores, offices, and other light commercial buildings, are often somewhat smaller than the doors of larger commercial buildings, public buildings, and grand homes. Older buildings often have smaller doors. Thickness: Most pre-fabricated doors are 1 3/8" thick (for interior doors) or 1 3/4" (exterior). Closets: small spaces such as closets, dressing rooms, half-baths, storage rooms, cellars, etc. often are accessed through doors smaller than passage doors in one or both dimensions but similar in design. Garages: Garage doors are generally 84" (7 feet; 2134 mm) or 96" (8 feet; 2438 mm) wide for a single-car opening. Two car garage doors (sometimes called double car doors) are a single door 192" (16 feet; 4877 mm). Because of size and weight these doors are usually sectional. That is split into four or five horizontal sections so that they can be raised more easily and don't require a lot of additional space above the door when opening and closing. Single piece double garage doors are common in some older homes.


Europe

Standard DIN doors are defined in DIN 18101 (published 1955–07, 1985–01, 2014–08). Door sizes are also given in the construction standard for wooden door panels (DIN 68706–1). The DIN commission created the harmonized European standard DIN EN 14351-1 for exterior doors and DIN EN 14351-2 for interior doors (published 2006–07, 2010–08), which define requirements for the CE marking and provide standard sizes by examples in the appendix. The DIN 18101 standard has a normative size (Nennmaß) slightly larger than the panel size (Türblatt) as the standard derives the panel sizes from the normative size being different single door vs double door and molded vs unmolded doors. DIN 18101/1985 defines interior single molded doors to have a common panel height of 1985 mm (normativ height 2010 mm) at panel widths of 610 mm, 735 mm, 860 mm, 985 mm, 1110 mm, plus a larger door panel size of 1110 mm x 2110 mm. The newer DIN 18101/2014 drops the definition of just five standard door sizes in favor of a basic raster running along 125 mm increments where the height and width are independent. Panel width may be in the range 485 mm to 1360 mmm, and the height may be in the range of 1610 mm to 2735 mm. The most common interior door is 860 mm x 1985 mm (33.8" x 78.1").


Doorways

When framed in wood for snug fitting of a door, the doorway consists of two vertical ''jambs'' on either side, a ''lintel'' or ''head jamb'' at the top, and perhaps a ''threshold'' at the bottom. When a door has more than one movable section, one of the sections may be called a ''leaf''. See
door furniture Door furniture (British and Australian English) or door hardware (North American English) refers to any of the items that are attached to a door or a drawer to enhance its functionality or appearance. Design of door furniture is an issue to ...
for a discussion of attachments to doors such as door handles, doorknobs, and door knockers. *
Lintel A lintel or lintol is a type of beam (a horizontal structural element) that spans openings such as portals, doors, windows and fireplaces. It can be a decorative architectural element, or a combined ornamented structural item. In the case of w ...
– A horizontal beam above a door that supports the wall above it. (Also known as a ''header'') * Jambs or legs – The vertical posts that form the sides of a door frame, where the hinges are mounted, and with which the bolt interacts. *
Door casing A door is a hinged or otherwise movable barrier that allows ingress (entry) into and egress (exit) from an enclosure. The created opening in the wall is a ''doorway'' or ''portal''. A door's essential and primary purpose is to provide security by ...
''door casing'',
door frame A door is a hinged or otherwise movable barrier that allows ingress (entry) into and egress (exit) from an enclosure. The created opening in the wall is a ''doorway'' or ''portal''. A door's essential and primary purpose is to provide security by ...
or chambranle – Is formed by the lintel and the two jambs. * Sill (for exterior doors) – A horizontal sill plate below the door that supports the door frame. Similar to a Window Sill but for a door *
Threshold Threshold may refer to: Architecture * Threshold (door), the sill of a door Media * ''Threshold'' (1981 film) * ''Threshold'' (TV series), an American science fiction drama series produced during 2005-2006 * "Threshold" (''Stargate SG-1''), ...
(for exterior doors) – A horizontal plate below the door that bridges the crack between the interior floor and the sill. *
Doorstop A doorstop (also door stopper, door stop or door wedge) is an object or device used to hold a door open or closed, or to prevent a door from opening too widely. The same word is used to refer to a thin slat built inside a door frame to prevent a ...
– a thin slat built inside the frame to prevent a door from swinging through when closed, an act which might break the hinges. *
Architrave In classical architecture, an architrave (; from it, architrave "chief beam", also called an epistyle; from Greek ἐπίστυλον ''epistylon'' "door frame") is the lintel or beam that rests on the capitals of columns. The term can ...
– The decorative molding that outlines a door frame, called an Archivolt if the door is arched. Sometimes called ''brickmold'' in North America. Door lock.jpg, Front door of a house with typical
door furniture Door furniture (British and Australian English) or door hardware (North American English) refers to any of the items that are attached to a door or a drawer to enhance its functionality or appearance. Design of door furniture is an issue to ...
: a letter box, door knocker, a latch and two locks Paris Rue de Douai5134.JPG, A door knocker with
putti A putto (; plural putti ) is a figure in a work of art depicted as a chubby male child, usually naked and sometimes winged. Originally limited to profane passions in symbolism,Dempsey, Charles. ''Inventing the Renaissance Putto''. University of ...
holding a
cartouche In Egyptian hieroglyphs, a cartouche is an oval with a line at one end tangent to it, indicating that the text enclosed is a royal name. The first examples of the cartouche are associated with pharaohs at the end of the Third Dynasty, but the fea ...
, in Paris Galerie dorée071.jpg, Pair of door knobs in the Galerie dorée de la Banque de France of the
Hôtel de Toulouse The Hôtel de Toulouse, former Hôtel de La Vrillière is located at 1 rue de La Vrillière, in the 1st arrondissement of Paris. It was built between 1635 and 1640 by François Mansart, for Louis Phélypeaux, seigneur de La Vrillière. Originally, ...
(Paris) St. Pancras Station (door & hinge). Camden.JPG, Hinge of a door of the
St Pancras railway station St Pancras railway station (), also known as London St Pancras or St Pancras International and officially since 2007 as London St Pancras International, is a central London railway terminus on Euston Road in the London Borough of Camden. It is ...
(London)


Related hardware

Door furniture or hardware refers to any of the items that are attached to a door or a drawer to enhance its functionality or appearance. This includes items such as hinges, handles, door stops, etc.


Safety

Door safety relates to prevention of door-related accidents. Such accidents take place in various forms, and in a number of locations; ranging from car doors to garage doors. Accidents vary in severity and frequency. According to the
National Safety Council The National Safety Council (NSC) is a 501(c)(3) nonprofit, public service organization promoting health and safety in the United States. Headquartered in Itasca, Illinois, NSC is a member organization, founded in 1913 and granted a congressi ...
in the United States, around 300,000 door-related injuries occur every year. The types of accidents vary from relatively minor cases where doors cause damage to other objects, such as walls, to serious cases resulting in human injury, particularly to fingers, hands, and feet. A closing door can exert up to 40
ton Ton is the name of any one of several units of measure. It has a long history and has acquired several meanings and uses. Mainly it describes units of weight. Confusion can arise because ''ton'' can mean * the long ton, which is 2,240 pounds ...
s per square inch of
pressure Pressure (symbol: ''p'' or ''P'') is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled ''gage'' pressure)The preferred spelling varies by country and e ...
between the
hinge A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation: all other ...
s. Because of the number of accidents taking place, there has been a surge in the number of
lawsuit - A lawsuit is a proceeding by a party or parties against another in the civil court of law. The archaic term "suit in law" is found in only a small number of laws still in effect today. The term "lawsuit" is used in reference to a civil actio ...
s. Thus organisations may be at risk when car doors or doors within buildings are unprotected. According to the US
General Services Administration The General Services Administration (GSA) is an independent agency of the United States government established in 1949 to help manage and support the basic functioning of federal agencies. GSA supplies products and communications for U.S. gover ...
, discussing child care centres:


Opening direction

Whenever a door is opened outward, there is a risk that it could strike another person. In many cases this can be avoided by
architectural design Building design refers to the broadly based architectural, engineering and technical applications to the design of buildings. All building projects require the services of a building designer, typically a licensed architect. Smaller, less complic ...
which favors doors which open inward to rooms (from the perspective of a common area such as a corridor, the door opens outward). In cases where this is infeasible, it may be possible to avoid an accident by placing
vision panel A vision panel is a small window in a door which allows people to look through without opening the door. Vision panels are sometimes in walls, generally adjacent to a door. These have implications in safety, primarily to avoid opening doors on a ...
s in the door.Home Safety Guidelines for Architects & Builders, NBS GCR 78-156, BOSTI, December 1978 Inward-hinged doors can also escalate an accident by preventing people from escaping the building: people inside the building may press against the doors, and thus prevent the doors from opening. Related accidents include: *
Grue Church fire On 26 May 1822, during the Pentecost service, the church at Grue, Norway, caught fire and at least 113 people were killed. It is the deadliest fire disaster in the history of Norway. Church The old Grue Church was located close to Skulstad, nor ...
: Grue, Norway in 1822 * Victoria Hall Disaster: Sunderland, UK in 1883 * Glen Cinema disaster: Paisley, UK in 1929 * Cocoanut Grove fire: Boston, USA in 1942 Today, the exterior doors of most large (especially public) buildings open outward, while interior doors such as doors to individual rooms, offices, suites, etc. open inward, as do many exterior doors of houses, particularly in North America.


Stops

Doorstop A doorstop (also door stopper, door stop or door wedge) is an object or device used to hold a door open or closed, or to prevent a door from opening too widely. The same word is used to refer to a thin slat built inside a door frame to prevent a ...
s are simple devices that prevent a door from contacting and possibly damaging another object (typically a wall). They may either absorb the force of a moving door, or hold the door against unintended motion.


Guards

Door guards (hinge guards, anti-finger trapping devices, or finger guards) help prevent finger trapping accidents, as doors pose a risk to children, especially when closing. Door guards protect fingers in door hinges by covering the hinge-side gap of an open door, typically with a piece of rubber or plastic that wraps from the door frame to the door. Other door safety products eject the fingers from the push side of the door as it closes. There are various levels of door protection. Anti-finger trapping devices in front may leave the rear hinge pin side of doors unprotected. Full door protection uses front and rear anti-finger trapping devices and ensures the hinge side of a door is fully isolated. A risk assessment of the door determines the appropriate level of protection. There is also handle-side door protection, which prevents the door from slamming shut on the frame, which can cause injury to fingers/hands.


Glass

Glass doors pose the risk of unintentional collision if a person is unaware there is a door, or thinks it is open when it is not. This risk is greater with sliding glass doors because they often have large single panes that are hard to see.
Sticker A sticker is a type of label: a piece of printed paper, plastic, vinyl, or other material with temporary or permanent pressure sensitive adhesive on one side. It can be used for decoration or for functional purposes, depending on the situation. ...
s or other types of warnings on the glass surface make it more visible and help prevent injury. In the UK, Regulation 14 of the Workplace (Health and Safety Regulations) 1992 requires that builders mark windows and glass doors to make them conspicuous. Australian Standards: AS1288 and AS2208 require that glass doors be made of laminated, tempered, or toughened glass.


Fire

Buildings often have special purpose doors that automatically close to prevent the spread of fire and smoke. Fire doors that are improperly installed or tampered with can increase risk during a fire. Sometimes, door closer mechanisms ensure fire doors remain closed. An additional fire risk is that doors may prevent access to
emergency service Emergency services and rescue services are organizations that ensure public safety and health by addressing and resolving different emergencies. Some of these agencies exist solely for addressing certain types of emergencies, while others deal wit ...
s personnel coming to fight the fire and rescue occupants, etc. Fire fighters must use door breaching techniques in these situations to gain access. Doors in public buildings often have
panic bar A crash bar (also known as a panic exit device, panic bar, or push bar)American National Standards Institute, ANSI/BHMA A156.3-2001, American National Standard for Exit Devices is a type of door opening mechanism which allows users to open a doo ...
s, which open the door in response to anyone pressing against the bar from the inside in the event of a fire or other emergency.


Automobiles

Vehicle doors present an increased risk of trapping hands or fingers due to the proximity of occupants. In some car accidents, injury to occupants from the movement of car doors occurs. Bicyclists cycling on public roads risk
dooring Dooring is the act of opening a Car door, motor vehicle door into the path of another road user. Dooring can happen when a driver has parked or stopped to exit their vehicle, or when passengers egress from cars, taxis and rideshares into the pat ...
: collision with an abruptly opened vehicle door. Because cyclists often ride near parked cars alongside the road, they are particularly vulnerable.


Aircraft

In
aircraft An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines ...
, doors from
pressurized {{Wiktionary Pressurization or pressurisation is the application of pressure in a given situation or environment. Industrial Industrial equipment is often maintained at pressures above or below atmospheric. Atmospheric This is the process by ...
sections to un-pressurized compartments or the exterior can pose risk if they open during flight. Air may rush out of the
fuselage The fuselage (; from the French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds crew, passengers, or cargo. In single-engine aircraft, it will usually contain an engine as well, although in some amphibious aircraft t ...
with sufficient velocity to eject unsecured occupants, cargo, and other items, and drastic pressure differences between compartments may make aircraft floors or other interior partitions fail. These concerns are typically mitigated with plug doors, which open in toward the pressurized compartment and are forced into their door frames by the difference in air pressure. Most cabin doors are of this type, but cargo doors typically open outward to maximise interior space, and require hefty locking mechanisms to overcome internal pressure and prevent
explosive decompression Uncontrolled decompression is an unplanned drop in the pressure of a sealed system, such as an aircraft cabin or hyperbaric chamber, and typically results from human error, material fatigue, engineering failure, or impact, causing a pressure vesse ...
. A number of aircraft accidents have involved outward-opening door failures, including: * American Airlines Flight 96 (1972) (design flaw) *
Turkish Airlines Flight 981 Turkish Airlines Flight 981 was a scheduled flight from Istanbul Yeşilköy Airport to London Heathrow Airport, with an intermediate stop at Orly Airport in Paris. On 3 March 1974, the McDonnell Douglas DC-10 operating the flight crashed into ...
(1974) (design flaw) *
1975 Tân Sơn Nhứt C-5 accident On 4 April 1975, a Lockheed C-5A Galaxy participating in the first mission of Operation Babylift crashed on approach during an emergency landing at Tan Son Nhut Air Base, South Vietnam. The cause was ascribed to loss of flight control due to exp ...
(poor maintenance) * United Airlines Flight 811 (1989) (design flaw)


See also

*
Biometrics Biometrics are body measurements and calculations related to human characteristics. Biometric authentication (or realistic authentication) is used in computer science as a form of identification and access control. It is also used to identify in ...
*
Closed-circuit television Closed-circuit television (CCTV), also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly t ...
* Coal hole *
Door loop A door loop or door cord is a mechanical device which provides a robust guideway for cabling between a swing door (the "door leaf") and a door frame. Door loops are described in the NFPA 80 standard for fire doors.{{Cite web, title=NFPA 80: Stan ...
, a method for providing electric cabling to a door * Door security *
Double margin doors Peter Brett in his book ''Purpose Made Joinery'' describes this door as a pair of narrow doors joined at the meeting stile to make a single door with the appearance of a pair.Brett, Peter. ''Carpentry and Joinery for Advanced Craft Students: Pur ...
* Electronic lock *
Hinge bender A hinge bender, also called a hinge tweaker or hinge adjuster, is a hand tool for adjusting hinges, for instance on doors and windows on buildings or on cars. A hinge bender can be used to straighten a door that is tilted sideways relative to the d ...
, a tool for adjusting door hinges *
Identity document An identity document (also called ID or colloquially as papers) is any documentation, document that may be used to prove a person's identity. If issued in a small, standard credit card size form, it is usually called an identity card (IC, ID c ...
*
IP camera An Internet Protocol camera, or IP camera, is a type of digital video camera that receives control data and sends image data via an IP network. They are commonly used for surveillance, but, unlike analog closed-circuit television (CCTV) cameras, ...
*
Janus In ancient Roman religion and myth, Janus ( ; la, Ianvs ) is the god of beginnings, gates, transitions, time, duality, doorways, passages, frames, and endings. He is usually depicted as having two faces. The month of January is named for Janu ...
, Roman god of doors *
Keycard A keycard lock is a lock operated by a keycard, a flat, rectangular plastic card. The card typically, but not always, has identical dimensions to that of a credit card or American and EU driver's license. The card stores a physical or digital ...
s * Locksmithing * Lock picking *
Logical security Logical Security consists of software safeguards for an organization’s systems, including user identification and password access, authenticating, access rights and authority levels. These measures are to ensure that only authorized users are a ...


Citations


General references

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External links

* {{Authority control Types of gates