Duct Collar w/Damper For Nominal Duct Diameter 6 in Material Steel Overall Length 5 in Material Thickness 24 ga Weight 1.51 lb Maximum Pressure Rating 3 in wc For Duct Height 6 in Shape Round End Type Crimped For Duct Width 6 in Gas Appliance Category Not Applicable Inlet Diameter 6 in Damper Type Low Leakage Inside Diameter 6 in Flange Outside Diameter 1 in Outside Diameter 6 in Flange Inside Diameter 6 in Color Silver Outlet Diameter 6 in Overall Height 6 in