NFPA 257-2017 PDF Download

NFPA 257: Standard on Fire Test for Window and Glass Block Assemblies is a standard that provides fire test procedures for windows and glass block assemblies. The standard aims to ensure that these assemblies do not contribute to the spread of fire. It applies to various types of light-transmitting assemblies used in window openings to prevent the passage of fire through fire-resistive walls.

NFPA 257 establishes controls for the fire test procedures and defines performance criteria and reporting procedures. The 2017 edition of the standard introduced a new time-temperature curve, expanding the test duration from 45 minutes to 3 hours to better reflect the test method. It also made changes to the time allowed between the fire test and the hose stream test, as well as updated the reference for the hose stream test procedure.

This standard is referenced by NFPA 101: Life Safety Code and NFPA 80: Standard for Fire Doors and Other Opening Protectives. It is essential for testing laboratories and manufacturers in ensuring compliance with fire safety regulations. The 2017 edition includes updated references to ensure users are working with the most current information.