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The UL Directory is covered in greater detail in the module Firestop System Selection, including the online version of the UL Directory. Following is an introduction to the Directory.Once a firestop system passes the standardized test, it is designated an hourly rating for F, T, and L. The UL directory contains a listing of all firestop systems that have passed their standard test (UL 1479) UL Classification: The method used by UL to rate application-oriented products like firestop materials, where the final configuration is different in each installation. Firestop materials passing the standardized test are “UL Classified". It is incorrect to call them “UL listed" or "UL approved".
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