Standard on Fire Test for Window and Glass Block Assemblies
The next edition of this standard is now open for Public Input (formerly proposals).
What is NFPA 257?
This document advances fire safety by establishing test protocols to measure how well window and glass block assemblies prevent or slow the spread of fire, providing a standardized method for comparing the relative performance of different fire window assemblies.
Official document scope
What does NFPA 257 address?
The standard 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 covers controls of the fire test as well as performance criteria and results for reporting procedures.
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