UL’s New “W” and “L” Ratings
UL’s New “W” and “L” Ratings December, 2004 ... non-fire-dampered ducts, electrical conduit and cables, cable trays, bus ducts, service items plus gaps and joints. Developed in 1983, UL 1479 has been used as a testing standard to qualify Through Penetration Firestop Systems. The UL 2079 qualification for expansion, walltops and ... ................
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