7 india Norm Opn Rnd Stel Zone Cntrl Dampr For Nominal Duct Diameter 7 in Damper Application Motorized Number of Panels Not Applicable Overall Height 9 1/8 in Overall Length 7 1/2 in Rough Opening Shape Round For Duct Shape Round Overall Width 7 in Frame Material Thickness Not Applicable Blade Material Galvanized Steel Maximum Air Pressure Not Applicable Overall Diameter 7 in Rough Opening Length 7 in Rough Opening Width 7 in Damper Type Dynamic