Greenheck’s new line of ceiling radiation dampers are UL classified for installation in wood truss floor/ceiling assemblies. Model CRD-1WT is designed with a plenum box for side inlet or outlet duct connections. Model CRD-2WT’s inlet or outlet duct connection is made on top of the damper. Manufactured of galvanized steel, both models feature a standard fusible link closure device to minimize pressure drop. An optional volume controller provides the functionality of a balancing damper and enables easy positioning of the blades, according to the company. Tested and listed in accordance with UL Standard 555C with ratings up to one hour, Models CRD-1WT and CRD-2WT are ideal for use in retirement facilities and nursing homes.