NFPA 257 窗及玻璃隔断的火灾试验方法
NFPA 257窗及玻璃隔断的火灾试验 – 标准名称
NFPA 257：Standard on Fire Test for Window and Glass Block Assemblies
NFPA 257：绝缘软套管规范-第2部分：试验方法
NFPA 257窗及玻璃隔断的火灾试验 – 适用范围
该标准规定了适用于评估防火窗组件（包括窗户，玻璃块和其他透光组件）的标准化防火和软管流测试程序，这些组件旨在阻止防火通过耐火等级墙壁中的开口蔓延。
该标准不应解释为确定防火窗组件在着火后能否继续使用的适合性。
该标准提供了比较防火窗组件性能的标准化方法。
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.
This standard is not to be construed as determining the suitability of fire window assemblies for continued use after fire exposure.
This standard provides a standardized method for comparing the performance of fire window assemblies.
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