Dayton 2C521 - Wall Backdraft Damper, Vertical Mount, 18 in Dia Fan, 21 in H x 21 in W x 6-1/4 in D, 2000 fpm
Dayton 2C521 - Wall Backdraft Damper, Vertical Mount, 18 in Dia Fan, 21 in H x 21 in W x 6-1/4 in D, 2000 fpm
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21 In.H-W 6 In.L Aluminum Wall Backdraft Dampr, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Galvanized Steel, Number of Panels 1, Maximum Air Velocity 2000 fpm, Overall Height 21 in, Rough Opening Diameter 18 1/2 in, Rough Opening Shape Square, Fits Fan Diameter 18 in, For Duct Shape Not Applicable, Free Area 2.1 sq ft, Overall Width 21 in, Frame Material Thickness 20 ga, Overall Length 6 in, Connection Type Not Applicable, Frame Depth 2 1/4 in
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