"220V AC Cooling Fan" features mainly reflected in long life, high reliability; smooth performance, run; intelligence, mechatronics, easy to control; small size, low power consumption; low noise, no electromagnetic interference. Of course, high-quality "220V AC Cooling Fan" shake itself will be very small, but the first two were, but it is difficult to overcome. To solve this problem, we can try to use larger size fan. Should be at the same air volume, a large "220V AC Cooling Fan" operating noise at a lower speed is less than the small fan operation noise at high speed. Another factor is that we tend to ignore the fan bearings.