NFPA 257

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Standard on Fire Test for Window and Glass Block Assemblies

This document advances fire safety by establishing test protocols to measure how well window and glass block assemblies prevent or slow the spread of fire, providing a standardized method for comparing the relative performance of different fire window assemblies.

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NFPA members and public sector officials may submit a question on an NFPA code or standard. Responses are provided by NFPA staff on an informal basis.
Happy Holidays! NFPA will be closed December 25 - January 1. We wish you all a safe & enjoyable holiday week and look forward to serving you in the new year.

NFPA 257: News & Research

News about NFPA codes and standards

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Happy Holidays! NFPA will be closed December 25 - January 1. Place your orders by Wednesday, December 13 to ensure domestic delivery by year end. We wish you all a safe & enjoyable holiday week and look forward to serving you in the new year.

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