ABSTRACT
Axial-flow fans are used in systems that have low resistance levels. Propeller-type axial-flow fans move air at pressures from 0 to 1 inch of water. Additional variations of the axial-flow fan can move air at somewhat higher pressures. For industrial plants, the needs of heating, ventilating, air conditioning, and pollution control are fulfilled by fans and blowers. Principal advantages of axial fans are their economy, installation simplicity, and small space requirements. Belt-driven fans can be used for motor requirements from 10 to up to 200 hp. Fiberglass-reinforced plastics fabricated fans also are used under corrosive conditions. Fans and blowers can be used as air pollution control devices or in conjunction with control equipment such as wet scrubbers, baghouses, electrostatic precipitators, and combustion units. Fans and blowers have innumerable applications as ventilating devices, aside from their industrial use. In-plant odor control involves the use of fans and blowers to force or induce contaminated air through various control devices.
