Available in Class I and II, standard Arrangement 1 and 9. The 2100 Series fans have been designed and engineered to meet the highest standards for maximum efficiency, low operating cost, quietness, stability, and non-overloading horsepower. This concept in design combines the reliable performance of scroll-type centrifugal fans with the space saving advantages of axial type fans. The 2100 Series fans are used for general building ventilation, commercial and industrial air conditioning, industrial process supply and exhaust, drying and cooling, combustion air supply, etc.   Features Benefits Airfoil bladed centrifugal wheel for efficient and quiet operation. In-line airflow eliminating costly elbows and duct configurations. Space saving compactness in both horizontal and vertical applications. Equal size inlet and outlet duct connection for ease of installation. Dependable rugged construction for long life and trouble free operation. Wide range of mounting arrangements, brackets and motor positions and accessories. Centrifugal Wheel​ The 2100 Series wheels are of the backwardly inclined airfoil blade type. The rims are spun for close tolerance fit to the die-formed blades. Trailing edges of the blades are welded. Blades are continuously welded to a heavy backplate and rim. All wheels are given accurate static and dynamic balance to insure smooth operation.   Options/Accessories Drive Guard Weather Cover Screens Access Door Drains and Weep Holes Shaft Seal Motor Mounting Slip Ring or Companion Angles Discharge Windband and Damper Roof Curb Mounting Base