7 In.dia SS Barometric Draft Control Damper Application Barometric Draft Control For Nominal Duct Diameter 6 in 7 in Frame Material Steel Number of Panels Not Applicable Maximum Air Velocity Not Applicable Overall Height 7 5/8 in Rough Opening Diameter 7 in Rough Opening Shape Round Fits Fan Diameter Not Applicable For Duct Shape Round Free Area Not Applicable Overall Width 7 5/8 in Frame Material Thickness 22 ga Overall Length 9 5/8 in Connection Type Press Fit