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What is UL W-L-2199 Firestop System Details about?

This document provides a firestop system rating for penetrating nonmetallic pipes through gypsum wallboard or steel stud walls. It received a 1 or 2 hour F Rating depending on the wall, and a 1 or 1-1/4 hour T Rating. The system uses steel wire mesh around the pipe, packing material, intumescent wrap strips, and a galvanized steel collar secured with anchors to maintain the annular space. Pipe sizes up to 8 inches in diameter made of PVC or CPVC can be used in this system.

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