Agricultural Exhaust Fan Assembled Assembled Blade Diameter 20 in Blade Material Polyethylene Drive Type Direct Drive Exhaust Airflow @ 0.000 in SP 3 730 cfm For Cut-Out Height 24 3/4 in For Cut-Out Width 23 1/2 in For Maximum Wall Thickness 10 in For Minimum Wall Thickness 2 in Frame Finish Polished Frame Material Polyethylene Guard Finish Powder Coated Guard Material Steel Guard Type Exhaust Housing Material Polyethylene Housing Finish Polished White Polypethylene