Window Terms Glossary

Nailing Fin: A vinyl or aluminum extension installed to the frame of a window or door which creates a positive seal between the window and the framed wall. commun in new construction windows..

NFRC: National Fenestration Rating CouncilĀ® -a non-profit organization that provides fair, accurate and credible energy performance ratings for windows and doors.

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NWWDA:National Wood Window and Door Association. Trade organization which has established many standards related to wood window and door products.