"Cooling Fan Manufacturer" said fan noise and friction, air flow related. Fan speed, the greater the amount of wind noise caused will be greater, in addition to the fan's own shock factor can not be ignored. Of course, fans of high-quality shock 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 a larger size "Cooling Fan Manufacturer". Should be at the same air volume, a large operating noise at a lower fan rotational speed must be less than the operating noise of small fan at high speed. Another factor is that we tend to ignore the fan bearings. Due to the high-speed rotation of the fan to be friction between the shaft and the bearing collision, it is also a major source of "Cooling Fan Manufacturer" noise.