The Industrial Airfoil Fan (IAF) is a high pressure centrifugal fan that is recognized for its heavy duty construction. Housings are strongly braced to resist high pressure movement. Shafts and bearings are sized for belt drive duty and provide years of uninterrupted life. Split pillow block roller bearings are standard on all IAF fans. Wheels are dynamically balanced for smoother running. Deep spun inlet cones guide the air into the wheel and over its hollow airfoil shaped blades, providing maximum efficiency and minimum sound levels. Static efficiencies exceed 80%, reducing the energy needed to move each cubic foot of air.