The National Fenestration Rating Council (NFRC) Board of Directors has approved six NFRC documents, now open for public review in accordance with the American National Standards Institute’s (ANSI) process. The public review and comment period will run from February 20 through April 6, 2026.
The documents
The documents submitted for public review, comment, and the full ANSI consensus process are:
- NFRC 100-2026[E0A0]: Procedure for Determining Fenestration Product U-factors
- NFRC 200-2026[E0A0]: Procedure for Determining Fenestration Product Solar Heat Gain Coefficient and Visible Transmittance at Normal Incidence
- NFRC 202-2026[E0A0]: Procedure for Determining Translucent Fenestration Product Visible Transmittance at Normal Incidence
- NFRC 203-2026[E0A0]: Procedure for Determining Visible Transmittance of Tubular Daylighting Devices
- NFRC 400-2026[E0A0]: Procedure for Determining Fenestration Product Air Leakage
- NFRC 500-2026[E0A0]: Procedure for Determining Fenestration Product Condensation Index Ratings
The documents, with changes from previous versions highlighted in markup format, are available here: NFRC Documents in Public Review. The documents will appear in the Standards Action on February 20, 2026, marking the beginning of the 45-day open public comment period.
