Due to excessive pressure or sudden strikes these blades might get bent or damaged.
Attic fan bearings noise.
If the fan blades are imbalanced or bent they can hit against one another or against other parts of the fan.
The internals of the electric motor and fan blade within the ceiling or attic fan are all balanced as well.
You need to secure the screws in place more tightly by rotating the screwdriver clockwise.
If the ball bearings are to blame you may need to lubricate them to reduce the friction and quiet the noise which is often described as a rubbing or humming sound.
Shut off the fan before examining the blades and see if there s a problem or not.
Remove the current worn out bearings and replace them.
Attic fans also have small ball bearings that help lubricate the fan s movement.
If the blades are unbalanced you can balance them yourself.
Blade is made of thin metal sheets in most of the household fans.
And there is no exception with the attic fans as well.
Different fan noises can be a clue as to what the problem may be.
Your ceiling fan may be creating a rattling sound grinding noise buzzing noise rubbing noise clicking noise humming noise or squeaking noise.
A gable attic fan is attached to the attic wall by screws and if they are loose the vibration can cause an awful noise.
Reasons behind your attic fan humming noise reason 1 of 4.
The attic fan tends to makes a humming noise when it has a few blades and is running at a high speed setting.
For example a rattling sound may mean loose parts.
Even the shaft bearings are designed to be a balanced entity of the motor.
A grinding noise may be from a faulty motor.
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.
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Due to regular wear and tear these bearings can become worn out or lose their lubrication ability.
Ceiling fans usually run smoothly and quietly but sometimes you may notice a ceiling fan noise that ruins the peaceful surroundings.
This can cause the fan to start making constant noise and in some cases even a loud squealing sound.
This will definitely produce noise while the blades are rotating.