12 In.dia GSteel Manual Control Dampr, Damper Application Control, For Nominal Duct Diameter 12 in, Frame Material Steel, Number of Panels 1, Maximum Air Velocity 3000 fpm, Overall Height Not Applicable, Rough Opening Diameter 12 in, Rough Opening...
12 In.dia GSteel Manual Control Dampr, Damper Application Control, For Nominal Duct Diameter 12 in, Frame Material Steel, Number of Panels 1, Maximum Air Velocity 3000 fpm, Overall Height Not Applicable, Rough Opening Diameter 12 in, Rough Opening...