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Firefighting Standards - NFPA 257

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NFPA 257

Standard on Fire Test for Window and Glass Block Assemblies
NFPA 257 - Standard on Fire Test for Window and Glass Block Assemblies

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.

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