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-SB

Curtain Fire Damper - 1-1/2 & 3 Hour - Dynamic - Style B - Integral Sleeve

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 vertically or horizontally in dynamic HVAC systems that continue to run in the event of fire. (See optional 3 hr. rating)

Product Information