Lloyd Industries 50CRDEA10P is a rectangular ceiling radiation damper designed to maintain the hourly ratings of floor-ceiling or roof-ceiling assemblies rated 3 hours or less. It is classified by Underwriters Laboratories, Inc. as a heat barrier in the Fire Resistance Directory. The damper is constructed of steel and is installed in the ceiling to create a smoke and draft barrier. It is supported by 12 gauge hanger wires and is attached to the duct drop using steel bolts, screws, or rivets.