NFPA 257 Standard on Fire Test for Window and Glass Block Assemblies
NFPA 257 窗及玻璃隔断的火灾试验方法
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.
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. (Softbound, 13 pp., 2007)