NFPA 257: Standard on Fire Test for Window and Glass Block Assemblies
Current Edition: 2012 Next Edition: 2017

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What is NFPA 257?
NFPA 257: Document Scope
1.1 Scope. 1.1.1 This standard prescribes standardized fire and hose stream test procedures that apply to the evaluation of fire window assemblies, including windows, glass block, and other light-transmitting assemblies intended to retard the spread of fire through openings in fire resistance–rated walls. 1.1.2 This standard is not to be construed as determining the suitability of fire window assemblies for continued use after fire exposure. 1.1.3 This standard provides a standardized method for comparing the performance of fire window 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.

Official document scope
What does NFPA 257 address?

The standard prescribes fire and hose stream test procedures that apply to fire window assemblies -- including window, glass block, and other light-transmitting assemblies -- intended for use in window openings to retard the spread of fire through openings in fire-resistive walls. It covers controls of the fire test as well as performance criteria and results for reporting procedures.

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