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Codes and standards published by NFPA are displayed as read-only under license from NFPA solely for use within this system. NFPA material may not be downloaded, printed, reproduced, or transferred.

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.

 

Document History

  1. NFPA (Fire) 257


    Fire Test for Window and Glass Block Assemblies, 2022 Edition

    • Most Recent
  2. NFPA (Fire) 257


    Fire Test for Window and Glass Block Assemblies, 2017 Edition

    • Historical Version
  3. NFPA (Fire) 257

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    viewing


    Fire Test for Window and Glass Block Assemblies, 2012 Edition

    • Historical Version
  4. NFPA (Fire) 257


    Fire Test for Window and Glass Block Assemblies, 2007 Edition

    • Historical Version
  5. NFPA (Fire) 257


    Standard on Fire Test for Window and Glass Block Assemblies, 2000 edition

    • Historical Version
  6. NFPA (Fire) 257


    Fire Tests for Window and Glass Block Assemblies, 1996 Edition

    • Historical Version