Round Bypass Zoning Damper Steel 10 in dia For Nominal Duct Diameter 10 in Damper Application Zoning Number of Panels Not Applicable Overall Height 28 in Overall Length 12 1/4 in Rough Opening Shape Round For Duct Shape Round Overall Width 13 1/4 in Frame Material Thickness Not Applicable Blade Material Galvanized Steel Maximum Air Pressure Not Applicable Overall Diameter 10 in Rough Opening Length 10 in Rough Opening Width 10 in Damper Type Dynamic