14 In.dia SS Barometric Draft Control Damper Application Barometric Draft Control For Nominal Duct Diameter 13 in 14 in Frame Material Steel Number of Panels Not Applicable Maximum Air Velocity Not Applicable Overall Height 15 1/2 in Rough Opening Diameter 14 in Rough Opening Shape Round Fits Fan Diameter Not Applicable For Duct Shape Round Free Area Not Applicable Overall Width 15 1/2 in Frame Material Thickness 20 ga Overall Length 19 1/4 in Connection Type Press Fit