Agricultural Exhaust Fan Assembled Assembled Blade Diameter 48 in Blade Material Steel Drive Type Belt Drive Exhaust Airflow @ 0.000 in SP 23 391 cfm For Cut-Out Height 56 1/4 in For Cut-Out Width 55 3/4 in For Maximum Wall Thickness 12 in For Minimum Wall Thickness 2 in Frame Finish Polished Frame Material Fiberglass Guard Finish Powder Coated Guard Material Steel Guard Type Exhaust Housing Material Fiberglass Housing Finish Polished Tan Fiberglass