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Fans - Troubleshooting

Guide to troubleshooting fan problems.

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

Related Topics

  • Ventilation Systems

    Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

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