Exhaust Fan Assembled Assembled Blade Diameter 42 in Blade Material Aluminum Control Type Rotary Dial Drive Type Direct Drive Exhaust Airflow @ 0.000 in SP 14 900 cfm For Cut-Out Height 45 in For Cut-Out Width 45 in For Maximum Wall Thickness 5 in For Minimum Wall Thickness 5 in Frame Finish Powder Coated Frame Material Aluminum Guard Finish Powder Coated Guard Material Steel Guard Type Intake Housing Material Aluminum Housing Finish Aluminum