12 In.dia SS Barometric Draft Control, Damper Application Barometric Draft Control, For Nominal Duct Diameter 11 in; 12 in, Frame Material Steel, Number of Panels Not Applicable, Maximum Air Velocity Not Applicable, Overall Height 13 1/4 in, Rough Opening Diameter 12 in, Rough Opening Shape Round, Fits Fan Diameter Not Applicable, For Duct Shape Round, Free Area Not Applicable, Overall Width 13 1/4 in, Frame Material Thickness 20 ga, Overall Length 16 1/2 in, Connection Type Press Fit
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