NFRC™ - National Fenestration Rating Council www.nfrc.org
The National Fenestration Rating Council is a non-profit, public/private organization created by the window, door and skylight industry. It is comprised of manufacturers, suppliers, builders, architects and designers, specifiers, code officials, utilities and government agencies. NFRC provides consistent ratings on window, door and skylight products. NFRC's primary goal is to provide accurate information to measure and compare the energy performance of window, door, or skylight products.