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Fans - Troubleshooting

Guide to troubleshooting fan problems.

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Excessive Vibration and Noise

Belts too loose - worn or oily belts
Speed too high
Damaged or unbalanced wheel
Bearings need lubrication or replacement
Fan surge
Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly

Low Capacity or Pressure

Poor fan inlet conditions - there should be a straight clear duct at the inlet
Incorrect direction of rotation - make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly
Improper wheel alignment

Overheated Motor

Motor improperly wired
Cooling air diverted or blocked
Improper inlet clearance
Incorrect fan RPM
Incorrect direction of rotation - make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly
Incorrect voltage

Overheated Bearings

Improper bearing lubrication
Excessive belt tension

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Related Topics

Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

Related Documents

Belt driven Fans - Fan vs. Motor Speed - Fan vs. motor speed in belt driven fans.
Fan Affinity Laws - The affinity laws can be used to calculate resulting volume capacity, head or power consumption when speed or wheel diameters are changed.
Fan Motors - Starting Torques - The motor must be capable of accelerating the fan wheel to it's operating speed.

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