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.[1]

NFRC labels provide performance ratings for such products in five categories: U-value, Solar Heat Gain Coefficient, Visible Transmittance, Air Leakage, and Condensation Resistance.[1] 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.


  1. ^ a b "Independently Tested and Certified Energy Performance". Energy Star. Retrieved 2015-01-20.

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