Exhaust Fan, Assembled Assembled, Blade Diameter 20 in, Blade Material Polypropylene, Drive Type Direct Drive, Exhaust Airflow @ 0.000 in SP 5,210 cfm, For -Out Height 21 1/2 in, For -Out Width 21 3/8 in, For Minimum Wall Thickness 3/4 in, Frame Material Fiberglass, Guard Finish Powder Coated, Guard Material Steel, Guard Type Intake, Housing Material Aluminum, Includes Intake Guard, Includes Dehumidistat No, Maximum Airflow 4,900 cfm