19-21 In.dia SS Barometric Draft Control, Damper Application Barometric Draft Control, For Nominal Duct Diameter 19 in; 20 in; 21 in, Frame Material Steel, Number of Panels Not Applicable, Maximum Air Velocity Not Applicable, Overall Height 22 in, Rough Opening Diameter 20 in, Rough Opening Shape Round, Fits Fan Diameter Not Applicable, For Duct Shape Round, Free Area Not Applicable, Overall Width 22 in, Frame Material Thickness 18 ga, Overall Length 27 3/8 in, Connection Type Press Fit
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