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Static 1.5 Hour Rated Dampers
UL 555 Classified 1½ hour fire rating
Building codes require fire dampers to maintain the fire-resistance ratings of walls, partitions, barriers, and floors when penetrated by ducts or other transfer openings. Static-rated-fire dampers used in HVAC systems automatically shut down in the event of a fire emergency. These are UL classified to standard 555 with fire-resistance rating of 1½ hours.