The CRD-2 is a UL555C classified damper designed to limit the radiant heat transfer through an opening in the ceiling membrane of a fire-resistance rated floor/ceiling assembly of three hours or less.

The CRD-1 is a UL555C classified damper designed to limit the radiant heat transfer through an opening in the ceiling membrane of a fire-resistance rated floor/ceiling assembly of three hours or less

Steel Duct-Mounted Opposed Blade Damper Gang operated blades (3 sets on Sizes 6” - 12”, 4 sets on Sizes 14” - 20”, 6 sets on Sizes 24” - 36”) distribute air evenly through the diffuser or duct. Adjustable at screwdriver operator slot