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Dynamic 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 air transfer openings. Fire dampers are UL 555 classified with a fire-resistance rating of 1½ hours. Dynamic-rated-fire dampers are used with HVAC systems that remain operational during a fire emergency.