U value vinyl doublepane window3/2/2023 This system was devised by the National Fenestration Rating Council (NFRC), and is used by the ENERGY STAR program ( 1, 2).Ī combination of factors including transmittance of sunlight, air leakage and solar heat gain coefficient are used to determine U-factor. U-factor is a rating system that measures the energy efficiency of building materials like doors, windows and skylights.
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