Vent Boot Hanger Boot Style Square to Round Adapter Collar Diameter 8 in Collar Connection Height 8 in Collar Connection Width 12 in Material Steel Compatible Register Height 12 in Compatible Register Width 12 in Duct Size 12 x 12 in Cap/Collar Material Steel Product Type Register Boot Damper Type None Standards Meets LEED IAQ 3.1 Credit Includes Air Tight Foam Gasket Drywall Mud Ring Dust And Debris Cover