6 In.dia GSteel Manual Balancing Dampr Damper Application Balancing For Nominal Duct Diameter 6 in Frame Material Steel Number of Panels 1 Maximum Air Velocity 2000 fpm Overall Height Not Applicable Rough Opening Diameter 6 in Rough Opening Shape Round Fits Fan Diameter Not Applicable For Duct Shape Round Overall Width Not Applicable Frame Material Thickness 16 ga Overall Length 6 3/8 in Connection Type Not Applicable Frame Depth 6 3/8 in Rough Opening Length Not Applicable