Shutter Mount Exhaust Fan, Assembled Assembled, Blade Diameter 20 in, Blade Material Steel, Control Type Pull Chain, Drive Type Direct Drive, Duct Diameter Not Applicable, Exhaust Airflow @ 0.000 in SP 3,300 cfm, For -Out Height 22 in, For -Out Width 22 in, For Maximum Wall Thickness 5 in, For Minimum Wall Thickness 5 in, Frame Finish Powder Coated, Frame Material Steel, Guard Finish Powder Coated, Guard Material Steel, Guard Type Intake, Housing Material Steel