Noisy fan or motor?
HI. The most common issue here will be with a loose motor shaft. This is the part that the fan blades are mounted on. When this occurs, the looseness will cause the motor, and shaft to wobble, thus, causing this noise you here at high speeds. The wobble is less violent during the slower speeds, so it is not loud, in this case.
The second issue will be a warped fan blade. This will cause the fan to rub against the shroud, thus, creating the noise, as well.
If the shaft is loose, or bent, the entire motor will need to be replaced. Now, if the fan blade is warped, you can, simply, unscrew the blade from the shaft, and replace it(on most model)
The range hood is extremely loud, and has been ever since it was bought. Has anyone tried retrofitting in a quieter squirrel cage?
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