UL 14B:2008 pdf download.Sliding Hardware for Standard，Horizontally Mounted Tin-Clad Fire Doors. 6 Hangers 6.1 Hangers for three-ply doors 6.1.1 FRAME A frame shall be made of flat-rolled steel, 3-1)2 in (89 mm) width, 3/8 in (9.5 mm) thi
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