Is that fan too loud, shaking too much or are the bearings failing prematurely? 

It could be due to an imbalance condition.

In-place dynamic balancing can greatly add to the life of bearings, motors, drive belts, 
and the structural
integrity of your rotating equipment.

Balancing is done with the equipment in-place at your facility.

Balancing:

• Reduces noise 
• Increases the life of bearings (reducing maintenance costs)
• Reduces fatigue to structure or frame