ANSI/NFRC 100-2026 Procedure for determining fenestration product U-factors
Publication Year
2026
Document Status
Current
Abstract
Uniform, industry-standard methodology to determine the thermal transmittance (U-factor) of fenestration products.
Document History
Supersedes ANSI/NFRC Standard 100-2023.
Publisher Information
National Fenestration Rating Council
An independent US non-profit organization that establishes objective window, door, and skylight energy performance ratings to help compare products.
