what are fenestration products
Visit the NFRC Community website for details on Membership. Get your product certified! NFRC has developed and operates a uniform national rating system for the energy performance of fenestration products, including windows, doors, skylights, and similar products. A vote cast by a small business owner is just as important as a vote from the largest, most profitable manufacturer. 2  When you vote, you are determining the standards the entire industry will use to rate the energy performance of fenestration products.