توضیحات :
NFPA 257 – Standard on Fire Test for Window and Glass Block Assemblies
۲۰۲۲ Edition
Chapter 1 Administration
۱-۱ Scope.
۱-۱-۱ 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.
۱-۱-۲ This standard is not to be construed as determining the suitability of fire window assemblies for continued use after fire exposure.
۱-۱-۳ This standard provides a standardized method for comparing the performance of fire window assemblies.
۱-۲* Purpose.
۱-۲-۱ This standard prescribes specific standardized fire and hose stream test procedures for determining the fire protection rating of window assemblies, glass block, and other light transmitting assemblies used in openings in fire resistancerated walls.
۱-۲-۲ This standard provides a means for evaluating the ability of a window, glass block, or other light-transmitting assemblies to remain in a wall opening during a prescribed fire test exposure, followed by the application of a hose stream.
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