6 In.dia Round Steel Vent Zone Cntrl Dampr, For Nominal Duct Diameter 6 in, Damper Application Zoning, Number of Panels Not Applicable, Overall Height 9 3/4 in, Overall Length 7 7/8 in, Rough Opening Shape Round, For Duct Shape Round, Overall Width 12 1/4 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, Maximum Air Velocity 160 CFM
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