M00015090
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NFPA (Fire) 257 Fire Test for Window and Glass Block Assemblies, 2012 Edition
standard by National Fire Protection Association, 01/02/2012
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Availability date: 07/30/2021
NFPA 257 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 establishes controls of the fire test as well as performance criteria and results for reporting procedures.
NFPA 257 is referenced by NFPA 101: Life Safety Code when being used to set up a window fire resistance rating in a fire rated wall assembly. The 2007 edition is completely reorganized for clarity and consistency with NFPA's Manual of Style.