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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.

Current Edition: 2022

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NFPA 257

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Happy holidays! NFPA® will be closed December 24–January 2. We wish you all a safe and enjoyable holiday week, and look forward to assisting you in the new year.

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Happy holidays! NFPA® will be closed December 24–January 2. Place your orders by Tuesday, December 14, to ensure domestic delivery by year end. We wish you all a safe and enjoyable holiday week, and look forward to assisting you in the new year.

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