On July 1, 2002, manufacturers of fire, smoke, and combination fire/smoke dampers must have their products comply with the new testing requirements of UL 555 and UL 555S. These new testing ...
Fire and smoke dampers are a proven and effective way to protect duct and air-transfer openings in walls, barriers, partitions, corridors, and shafts. Since the inception of Underwriters Laboratories ...
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