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Industrial Fan Troubleshooting
Industrial Fan Troubleshooting
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Industrial Fan Troubleshooting

The two most common causes of industrial fans not operating efficiently are:

  1. The impeller is rotating in the wrong direction
  2. Inadequate transitions or elbows on the inlet or outlet of the fan (which can reduce performance by up to 60%)

The below chart lists several common industrial fan operational concerns and a variety of potential causes of these problems.

Insufficient Air Flow Duct elbows near fan inlet or outlet
Restricted fan inlet or outlet
Impeller rotating in wrong direction
Fan speed lower than design
System resistance higher than design
Dampers shut
Faulty ductwork
Dirty or clogged filters and/or coils
Inlet or outlet screens clogged
Excessive Air Flow System resistance less than design
Fan speed too high
Filters not in place
Registers or grilles not installed
Improper damper adjustment
Excessive Power Draw Fan speed higher than design
Gas density higher than design
Impeller rotating in wrong direction
Static pressure less than anticipated
Fan size or type not appropriate for application
Overheating Bearings Excessive amount of lubricant
Contaminated lubricant
Old lubricant
Excessive Vibration Accumulated material on impeller
Worn or corroded impeller
Bent shaft
Impeller or pulleys loose on shaft
Motor out of balance
Impeller out of balance
Pulleys eccentric or out of balance
Bearing or drive misalignment
Mismatched belts
Belts too loose or too tight
Loose or worn bearings
Loose bearing bolts
Loose fan mounting bolts
Weak or resonant foundation
Foundation unlevel
Structures not cross braced
Fan operating in unstable system condition
Worn coupling
Inoperative Fan Blown fuse
Broken belts
Loose pulley
Motor too small
Wrong voltage
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