NFRC 100

A National Fenestration Rating Council standard. 

NFRC 100 specifies a method for determining fenestration product U-factor (thermal transmittance).

This procedure covers products of all frame materials including but not limited to aluminum, steel, thermally broken aluminum, wood, vinyl, reinforced vinyl, fiberglass, and plastic, used singly or in combination. NFRC 100 also covers products of all operator or unit types including but not limited to vertical sliding windows, horizontal sliding windows, casement windows, projecting windows, fixed windows, non-standard shaped and non-rectangular windows, glazed wall systems, glazings for site built fenestration products, garden or greenhouse windows, bay or bow windows, and skylights.

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