A rigid base which allows the fan, motor and drives to be transported and installed as a complete unit is often desirable. It ensures that the various items are correctly aligned and that vee belt drives are correctly tensioned. When anti-vibration mountings are fitted below the baseframe it becomes essential to ensure that both fan and motor vibrate as one and that belt tension is maintained by fixing their relative positions. (It would be helpful to refer to Chapter 8, Figure 8.8.)
Baseframes are of many varieties but the following are the most popular:
A) Fabricated from rolled steel channels welded or bolted together as appropriate. A heavy duty construction, which gives the desired mass when used with anti-vibration mountings, (see Figure 16.8).
Figure 16.8 Fan set on rolled steel channel baseframe 262 FANS & VENTILATION
B) Sheet steel fabrication of appropriate depth to give rigidity, usually constructed from parts produced by a turret punch or a laser (see Figure 16.9).
C) Angled fabrication from slotted square section (see again Figure 16.1) designed to give reduced drive centres and an overall reduced “footprint”.
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