Exhaust Fan, Assembled Assembled, Blade Diameter 18 in, Blade Material Polypropylene, Drive Type Direct Drive, Exhaust Airflow @ 0.000 in SP 3,800 cfm, For Cut-Out Height 19 1/2 in, For Cut-Out Width 19 7/16 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 3,750 cfm