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UL System No. F-A-1057 Firestop Penetration

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Through-penetration firestop system for pipes passing through a floor assembly, designated as UL System No. F-A-1057 by 3M Company. The assembly achieves a two-hour F rating, two-hour T rating, ambient L rating of two cubic feet per minute per square foot, 400-degree-Fahrenheit L rating of less than one cubic foot per minute per square foot, and Class 1 W rating. Penetrants include steel pipe, iron pipe, copper tubing, or copper pipe. The firestop system consists of packing material, fill, void, or cavity materials such as caulk, sealant, or putty, and duct wrap material bearing the UL classification marking.

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