NFPA 257 Fire Test for Window and Glass Block Assemblies – Standard
NFPA 257：Standard on Fire Test for Window and Glass Block Assemblies
NFPA 257 Fire Test for Window and Glass Block Assemblies – Scope
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.