In order to get rid of the hum you need to either operate the fan at a low speed or replace the fan with a new one that has more blades.
Noise attic exhaust fan.
The last remaining option is to replace your attic fan with a new and quieter model.
Due to excessive pressure or sudden strikes these blades might get bent or damaged.
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Due to regular wear and tear these bearings can become worn out or lose their lubrication ability.
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The attic fan tends to makes a humming noise when it has a few blades and is running at a high speed setting.
Attic fan making humming noise.
Reasons behind your attic fan humming noise reason 1 of 4.
Remove the current worn out bearings and replace them.
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After that different parts get worn down and require fixing or replacement.
This can cause the fan to start making constant noise and in some cases even a loud squealing sound.
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Get a quieter attic fan.
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And there is no exception with the attic fans as well.
Perhaps you don t feel like repairing it or you can t find the right parts either.
Attic fans usually last around 4 5 years if they re used regularly.