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Minimum Efficiency Reporting Value
Minimum Efficiency Reporting Value, commonly known as MERV, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to report the effectiveness of air filters in more detail than other ratings. For example, often a HEPA filter is impractical in residential central HVAC systems due to the large pressure drop the dense filter material causes. Experiments indicate that less obstructive, medium-efficiency filters of MERV 7 to 13 are almost as effective as true HEPA filters at removing allergens within residential air handling units. The scale is designed to represent the worst-case performance of a filter when dealing with particles in the range of 0.3 to 10 micrometers. The MERV value is from 1 to 20. Higher MERV values correspond to a greater percentage of particles captured on each pass, with a MERV 16 filter capturing more than 95% of particles over the full range. The table displayed below is a grouping of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Society Of Heating, Refrigerating And Air-Conditioning Engineers
The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE ) is an American professional association seeking to advance heating, ventilation, air conditioning and refrigeration (HVAC&R) systems design and construction. ASHRAE has over 57,000 members in more than 132 countries worldwide. ASHRAE's members are composed of building services engineers, architects, mechanical contractors, building owners, equipment manufacturers' employees, and others concerned with the design and construction of HVAC&R systems in buildings. The society funds research projects, offers continuing education programs, and develops and publishes technical standards to improve building services engineering, energy efficiency, indoor air quality, and sustainable development. History ASHRAE was founded in 1894 at a meeting of engineers in New York City, formerly headquartered at 345 East 47th Street, and has held an annual meeting since 1895. Until 1954 it was known as the Ame ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Air Filters
A particulate air filter is a device composed of fibrous, or porous materials which removes solid particulates such as dust, pollen, mold, and bacteria from the air. Filters containing an adsorbent or catalyst such as charcoal (carbon) may also remove odors and gaseous pollutants such as volatile organic compounds or ozone. Air filters are used in applications where air quality is important, notably in building ventilation systems and in engines. Some buildings, as well as aircraft and other human-made environments (e.g., satellites, and Space Shuttles) use foam, pleated paper, or spun fiberglass filter elements. Another method, air ionizers, use fibers or elements with a static electric charge, which attract dust particles. The air intakes of internal combustion engines and air compressors tend to use either paper, foam, or cotton filters. Oil bath filters have fallen out of favour aside from niche uses. The technology of air intake filters of gas turbines has improved signific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HEPA
HEPA (, high-efficiency particulate air) filter, also known as high-efficiency particulate absorbing filter and high-efficiency particulate arrestance filter, is an efficiency standard of air filters. Filters meeting the HEPA standard must satisfy certain levels of efficiency. Common standards require that a HEPA air filter must remove—from the air that passes through—at least 99.95% (ISO, European Standard) or 99.97% (ASME, U.S. DOE) of particles whose diameter is equal to 0.3 μm, with the filtration efficiency increasing for particle diameters both less than and greater than 0.3 μm. HEPA filters capture pollen, dirt, dust, moisture, bacteria (0.2-2.0 μm), virus (0.02-0.3 μm), and submicron liquid aerosol (0.02-0.5 μm). Some microorganisms, for example, ''Aspergillus niger'', ''Penicillium citrinum'', ''Staphylococcus epidermidis'', and ''Bacillus subtilis'' are captured by HEPA filters with photocatalytic oxidation (PCO). A HEPA filter is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micrometre
The micrometre ( international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is a unit of length in the International System of Units (SI) equalling (SI standard prefix "micro-" = ); that is, one millionth of a metre (or one thousandth of a millimetre, , or about ). The nearest smaller common SI unit is the nanometre, equivalent to one thousandth of a micrometre, one millionth of a millimetre or one billionth of a metre (). The micrometre is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cells and bacteria, and for grading wool by the diameter of the fibres. The width of a single human hair ranges from approximately 20 to . The longest human chromosome, chromosome 1, is approximately in length. Examples Between 1 μm and 10 μm: * 1–10 μm – length of a typical bacterium * 3–8 μm – width of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dust Mites
House dust mites (HDM, or simply dust mites) are various species of acariform mites belonging to the family Pyroglyphidae that are found in association with dust in dwellings. They are known for causing allergies. Biology Species The currently known species are: * ''Dermatophagoides farinae'' (American house dust mite) * ''Dermatophagoides pteronyssinus'' (European house dust mite) * '' Dermatophagoides evansi'' * '' Dermatophagoides microceras'' * '' Dermatophagoides halterophilus'' * ''Dermatophagoides siboney'' * ''Dermatophagoides neotropicalis'' * ''Dermatophagoides alexfaini'' * ''Dermatophagoides anisopoda'' * ''Dermatophagoides chirovi'' * ''Dermatophagoides deanei'' * ''Dermatophagoides rwandae'' * ''Dermatophagoides scheremeteroskyi'' * ''Dermatophagoides scheremetewskyi'' * ''Dermatophagoides simplex'' * ''Euroglyphus maynei'' (Mayne's house dust mite) * '' Euroglyphus longior'' * '' Hirstia domicola'' * '' Malayoglyphus carmelitus'' * '' Malayoglyphus intermedius'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ANSI
The American National Standards Institute (ANSI ) is a private non-profit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States. The organization also coordinates U.S. standards with international standards so that American products can be used worldwide. ANSI accredits standards that are developed by representatives of other standards organizations, government agencies, consumer groups, companies, and others. These standards ensure that the characteristics and performance of products are consistent, that people use the same definitions and terms, and that products are tested the same way. ANSI also accredits organizations that carry out product or personnel certification in accordance with requirements defined in international standards. The organization's headquarters are in Washington, D.C. ANSI's operations office is located in New York City. The ANSI annual operating b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ASHRAE
The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE ) is an American professional association seeking to advance heating, ventilation, air conditioning and refrigeration (HVAC&R) systems design and construction. ASHRAE has over 57,000 members in more than 132 countries worldwide. ASHRAE's members are composed of building services engineers, architects, mechanical contractors, building owners, equipment manufacturers' employees, and others concerned with the design and construction of HVAC&R systems in buildings. The society funds research projects, offers continuing education programs, and develops and publishes technical standards to improve building services engineering, energy efficiency, indoor air quality, and sustainable development. History ASHRAE was founded in 1894 at a meeting of engineers in New York City, formerly headquartered at 345 East 47th Street, and has held an annual meeting since 1895. Until 1954 it was known as the Ame ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Home Depot
The Home Depot, Inc., is an American multinational corporation, multinational home improvement retail corporation that sells tools, construction products, appliances, and services, including fuel and transportation rentals. Home Depot is the largest home improvement retailer in the United States. In 2021, the company had 490,600 employees and more than $151 billion in revenue. The company is headquartered in incorporated Cobb County, Georgia, with an Atlanta mailing address. It operates many big-box store, big-box format stores across the United States (including the District of Columbia, Guam, Puerto Rico and the United States Virgin Islands, U.S. Virgin Islands); all 10 provinces of Canada; and all 32 Mexican states and Mexico City. Maintenance, repair, and operations, MRO company Interline Brands (now The Home Depot Pro) is also owned by The Home Depot, with 70 distribution centers across the United States. It has been involved in several controversies, primarily involving t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microparticle Performance Rating
The Microparticle Performance Rating (MPR) is an Air filter rating system created by the company 3M. It rates the ability of an air filter to filter out micro particles. Because MPR was created by 3M, it only applies to filters produced by the 3M brand. The higher the MPR, the better the filter's ability to capture particles from the air as it passes through the filter. MPR is different from MERV Merv ( tk, Merw, ', مرو; fa, مرو, ''Marv''), also known as the Merve Oasis, formerly known as Alexandria ( grc-gre, Ἀλεξάνδρεια), Antiochia in Margiana ( grc-gre, Ἀντιόχεια ἡ ἐν τῇ Μαργιανῇ) and ..., the Minimum Efficiency Reporting Value. The MERV system measures a filter's ability to capture large particles. The MPR only takes into account the microscopic particles between 0.3 and 1 µm. References External links MPR vs. MERV a piece of 3M promotional material giving some minimum capture rates for rating levels ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ULPA
ULPA is an acronym for "Ultra-low Penetration Air (filter)". An ULPA filter can remove from the air at least 99.999% of dust, pollen, mold, bacteria and any airborne particles with a minimum particle penetration size of 120 nanometres (0.12 µm, ultrafine particles). A ULPA filter can remove (to a large extent, not 100%) – oil smoke, tobacco smoke, rosin smoke, smog, insecticide dust.David A. John. Air-distribution design: HEPA or ULPA filtration.Air distribution design HEPA or ULPA filtrationASHRAE Journal, vol. 55, no. 5, May 2013 It can also remove carbon black to some extent. Some Fan filter unit A fan filter unit (FFU) is a type of motorized air filtering equipment. It is used to supply purified air to cleanrooms, laboratories, medical facilities or microenvironments by removing harmful airborne particles from recirculating air. The units ...s incorporate ULPA filters. Materials used in ULPA filters Both HEPA and ULPA filter media have similar designs. The filter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microparticle Performance Rating
The Microparticle Performance Rating (MPR) is an Air filter rating system created by the company 3M. It rates the ability of an air filter to filter out micro particles. Because MPR was created by 3M, it only applies to filters produced by the 3M brand. The higher the MPR, the better the filter's ability to capture particles from the air as it passes through the filter. MPR is different from MERV Merv ( tk, Merw, ', مرو; fa, مرو, ''Marv''), also known as the Merve Oasis, formerly known as Alexandria ( grc-gre, Ἀλεξάνδρεια), Antiochia in Margiana ( grc-gre, Ἀντιόχεια ἡ ἐν τῇ Μαργιανῇ) and ..., the Minimum Efficiency Reporting Value. The MERV system measures a filter's ability to capture large particles. The MPR only takes into account the microscopic particles between 0.3 and 1 µm. References External links MPR vs. MERV a piece of 3M promotional material giving some minimum capture rates for rating levels ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corsi–Rosenthal Box
The Corsi–Rosenthal Box, also called Corsi–Rosenthal Cube and Comparetto Cube, is a design for a do-it-yourself air purifier that can be built comparatively inexpensively. It was designed during the COVID-19 pandemic, with the goal of reducing the levels of airborne viral particles in indoor settings. Background and history Since COVID-19 was declared a pandemic by the World Health Organization on 11 March 2020, evidence, including increasing amounts of peer-reviewed research, has been accumulating that severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus causing COVID-19, is airborne. Superspreading events are generally associated with indoor gatherings. In response to the emerging evidence and recommendations of infectious disease researchers, engineers began to consider how improved ventilation may reduce indoor viral loads. Air purification units with HEPA filtration can be expensive, often costing considerably more than . In August 2020, Richard C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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