Model:FDD-SC Curtain Fire Damper - 1-1/2 & 3 Hour - Dynamic or Static - Integral Sleeve - Round, Oval, Rectangular & Low Profile Transitions Optional
APPLICATION 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)