Dayton 2C521 Wall Backdraft Damper Vertical Wall 18 1/2 In X 18 1/2 In

Dayton 2C521 Wall Backdraft Damper, Vertical, Wall, 18 1/2 In X 18 1/2 In|Item Condition: New|Type: Ventilation > Shutters and Accessories|Item Diameter: N/A|Voltage: N/A|Item Length: 22.500|Compatible Brand: DAYTON|Color: N/A|Power Source: N/A|Item Width: 21.700|Item Weight: 5.8000|MPN: 2C521|Model: 2C521|Features: 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|Country/Region of Manufacture: US|Custom Bundle: No|California Prop 65 Warning: N|Bundle Description: No|Weight: 5.8000|Length: 22.500|Width: 21.700|Depth: 21.700|Number of Batteries: N/A|Battery Size: N/A|Battery Included: No|Motor Type: N/A|Battery Capacity: N/A|Battery Life: N/A|Cable Length: N/A|