Terminology

Thermal Ratings

The National Fenestration Ratings Council (NFRC) has developed and operates a uniform national rating system for the energy performance of windows, doors and similar products.

Thermal Ratings

The National Fenestration Ratings Council (NFRC) has developed and operates a uniform national rating system for the energy performance of windows, doors, and similar products.

Willmar^® Vinyl Window Thermal Performance Data PDF
DF^® Vinyl Window Thermal Performance Data PDF
DF^® Hybrid Window Thermal Performance Data PDF
Versa United^® Vinyl Window Thermal Performance Data PDF

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