NFRC (National Fenestration Rating Council®): a non-profit organization that certifies the energy ratings for doors, windows and skylights.
Nailing Fin: a flange around a window frame used for attachment to the stud wall.
National Certified Testing Laboratories: an independent testing lab that tests home products for certification groups such as the NFRC.
North-light roof: a roof having a saw tooth configuration with clerestory windows on the north-facing side.
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