The USA’s National Fire Protection Association has recently published NFPA 257 — Standard on fire test for window and glass block assemblies (2017 edition). The 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. The standards should not be construed as determining the suitability of fire window assemblies for continued use after fire exposure. However, it provides a standardized method for comparing the performance of fire window assemblies. This standard can be viewed online, free of charge, by registering at: www.nfpa.org
