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 Cut-Out Height 21 1/2 in For Cut-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