Fan Performance Characteristics of Centrifugal Fans - Aerovent

For higher efficiencies most manufacturers offer somevariation of the air wheel (AW) impeller, Figure 8b, tooperate in the same housing as the straight radial bladeimpellers. For even higher efficiencies and airflow, manufacturersalso offer a radial tip (RT) impeller; however,in most cases the radial tip impeller operates in a housingsimilar to the backward inclined design. The radialtip design fills the gap between the clean air backwardinclined fans and the more rugged radial blade fans.Both the air wheel and the radial tip impellers areideal for contaminated airstreams but neither is intendedfor bulk material handling. Both impellers have pressurecharacteristics similar to the backward inclined impellersand a horsepower characteristic similar to the radialblade and forward curve impellers. Unlike the straightradial blade impellers these two impeller designs doexhibit some instability left of peak and should alwaysbe selected to the right of peak.By and large, the radial blade series of fans are usedexclusively in the industrial market for handling and conveyingvarious process materials and gases. They areused for “high pressure” air systems and for combustionair. Generally speaking, they are furnished in belt drivearrangements due to the high shock loads and harshenvironments to which they are exposed.®Aerovent | www.aerovent.com5959 Trenton Lane N | Minneapolis, MN 55442 | Phone: 763-551-7500 | Fax: 763-551-7501