18 In. Heavy Duty Exhaust Fan with Automatic Shutter

Shutter Mount Exhaust Fan, Assembled Assembled, Blade Diameter 18 in, Blade Material Aluminum, Control Type Wired into Electrical System, Drive Type Direct Drive, Duct Diameter Not Applicable, Exhaust Airflow @ 0.000 in SP 3,000 cfm, For Cut-Out Height 20 3/4 in, For Cut-Out Width 20 3/4 in, For Maximum Wall Thickness 5 1/2 in, For Minimum Wall Thickness 3 1/4 in, Frame Finish Galvanized Steel, Frame Material Aluminum, Guard Finish Powder Coated, Guard Material Steel, Guard Type Exhaust