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Dynamic Fire Dampers

Dynamic (Fans On) Fire dampers are UL555 tested and labeled devices installed in ducts and air transfer openings or air distribution systems, designed to close upon the detection of heat.

FDD-R

True Round Fire Damper - Dynamic or Static 1-1/2 Hour
True Round Fire Damper - Dynamic or Static 1-1/2 Hour

Product Overview

UL Classified for installation in walls, floors, and partitions with a fire rating of less than 3 hours. This damper may be installed horizontally or vertically in static systems (FD-R) that shut down in the event of fire or dynamic systems (FDD-R) that continue to operate in the event of fire.
Product Information
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