6 india Norm Opn Rnd Stel Zone Cntrl Dampr For Nominal Duct Diameter 6 in Damper Application Motorized Number of Panels Not Applicable Overall Height 8 1/8 in Overall Length 6 1/4 in Rough Opening Shape Round For Duct Shape Round Overall Width 6 in Frame Material Thickness Not Applicable Blade Material Galvanized Steel Maximum Air Pressure Not Applicable Overall Diameter 6 in Rough Opening Length 6 in Rough Opening Width 6 in Damper Type Dynamic