Fan, motor and reduction gearing selection
Fan blading is manufactured from aluminium or fiber-reinforced plastic. The air flow rate and noise emission specifications determine the number of blades, the blade shape and the fan speed. All fans are balanced in accordance with applicable standards and codes.
Belts and pulleys are normally used for all motor ratings. Dynamic balancing is provided for pulleys. V-belt, toothed belt and power band drives are available. Gear drives are limited to large motors.
The following systems are employed to control air flow, either single or in combination:
- louvers (manual or automatic)
- pole reversing motors
- frequency converters
| | |
