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
Fan Affinity Laws Affinity laws can be used to calculate volume capacity, head
or power consumption - when speed or rpm, and wheel diameters are changed
Fan Motors - Starting Torques A fan motor must be capable not only of driving the fan at operating speed, but also be capable of accelerating the fan wheel to
operating speed
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