Symptoms
- Fan is noticeably louder than it used to be
- Rattling, grinding, or high-pitched whine while running
- Noise changes when the fan is touched or the housing is pressed
Likely causes
- CommonDust and lint buildup on the fan bladeAn unbalanced, dust-coated blade creates noise and vibration.
- CommonA loose fan housing or mounting bracketVibration over time can loosen the housing's connection to the ceiling.
- PossibleWorn motor bearingsAging motors develop grinding or whining noises as bearings wear down.
- PossibleLoose or damaged ductwork rattling with airflowFlexible ducting connected to the fan can rattle if it's loose or crimped.
What to do
- Turn off power to the fan at the breaker before removing the grille cover.
- Vacuum and wipe down the fan blade and housing to remove dust and lint buildup.
- Check and tighten the screws securing the housing to the ceiling joists.
- Spin the blade by hand to feel for roughness or grinding in the motor.
- Check accessible ductwork near the fan for looseness or damage.
- Replace the motor or the whole fan unit if cleaning doesn't quiet a grinding noise.
- Consider upgrading to a quieter-rated fan if noise has always been an issue rather than a new problem.
Tools and parts
- Screwdriver
- Vacuum with brush attachment
- Step ladder
Replacement bathroom fan motorSearch: “bathroom fan replacement motor”
When to call a pro
Call an electrician or HVAC technician if cleaning doesn't help and the motor needs replacing.
Safety
Use caution
Turn off the breaker before removing the fan cover or touching the blade or motor.