10 In.dia Steel Control Damper Damper Application Control For Nominal Duct Diameter 10 in Frame Material Not Applicable Number of Panels Not Applicable Maximum Air Velocity 1200 fpm Overall Height Not Applicable Rough Opening Diameter Not Applicable Rough Opening Shape Not Applicable Fits Fan Diameter Not Applicable For Duct Shape Round Free Area Not Applicable Overall Width Not Applicable Frame Material Thickness Not Applicable Frame Depth Not Applicable