Shutter Mount Exhaust Fan Assembled Assembled Blade Diameter 20 in Blade Material Aluminum Control Type Rotary Dial Drive Type Direct Drive Duct Diameter Not Applicable Exhaust Airflow @ 0.000 in SP 3 620 cfm For Cut-Out Height 22 in For Cut-Out Width 22 in For Maximum Wall Thickness 5 in For Minimum Wall Thickness 5 in Frame Material Aluminum Guard Finish Chrome Guard Material Steel Guard Type Intake Housing Material Aluminum Housing Finish Aluminum Includes Shutter