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We have 3 new metal membrane penetration systems live on the UL directory website: Through-penetration Firestop Systems C-AJ-2679 F-A-2235 F-A-2277 F-C-2408 W-J-2266 W-J-2324 W-J-7071 [...]
 FIRESTOP 101: Basic Firestop Training Learn the fundamentals of firestop, from containment to control and everything in-between. Over 1200 Tested UL Systems On-Site [...]
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