Whether it is for any "220V AC Cooling Fan" and we all need to go to maintain, as the product when in use less prone to failure and long life.
The first  regularly to check the fan motor, and some other parts of the skeleton whether screw loosening.
Second.  Periodic inspection "220V AC Cooling Fan" blade screws are loose.
Third.  Check whether the fan motor is running well, it has slowed down, there is no cushion to start, whether excessive noise and other phenomena.
The fourth  control "220V AC Cooling Fan" switch is stable and maintain a good line
Fifth  Check whether the voltage stability and maintaining a good line
Sixth.  Need to keep clean fan