National Fenestration Rating Council
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The National Fenestration Rating Council (NFRC) is a United States 501(c)3 non-profit organization which sponsors an energy efficiency certification and labeling program for windows, doors, and skylights.
NFRC labels provide performance ratings for such products in five categories: U-Factor, Solar Heat Gain Coefficient, Visible Transmittance, 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.
- "Independently Tested and Certified Energy Performance". Energy Star. Retrieved 2015-01-20.
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