Model:FD-R (FDD-R) True Round Fire Damper - Dynamic or Static 1-1/2 Hour
APPLICATION 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.