The National Fenestration Rating Council (NFRC) is a United States
501(c)3 non-profit organization which sponsors an
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 ...
certification and labeling program for windows, doors, and skylights.
NFRC labels provide performance ratings for such products in five categories:
U-value
In the context of construction, the R-value is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive flow of heat. R-value is the temperature difference pe ...
,
Solar Heat Gain Coefficient
Solar gain (also known as solar heat gain or passive solar gain) is the increase in thermal energy of a space, object or structure as it absorbs incident solar radiation. The amount of solar gain a space experiences is a function of the total in ...
,
Visible Transmittance
Transmittance of the surface of a material is its effectiveness in transmitting radiant energy. It is the fraction of incident electromagnetic power that is transmitted through a sample, in contrast to the transmission coefficient, which is th ...
,
Air Leakage, and
Condensation Resistance.
This allows architects, builders, code officials, contractors, home owners, and specifiers to compare the energy efficiency among products, and determine whether a product meets
code.
References
External links
*
Standards organizations in the United States
Certification marks
Building engineering organizations
Energy conservation in the United States
Windows
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