Information exchange cooling fan [fan] fan http://www.szdosense.com 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, high-quality cooling fan will shake itself is small, but the first two were but it is difficult to overcome. To solve this problem, we can try to use larger size power cooling fan. 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. Because when the cooling fan speed rotation friction between the shaft and the bearing to be a collision, it is also a major source of cooling fan noise. SHENZHEN woo Electronics Co., Ltd. for your friendship recommend: Supply cooker fan http://www.szdosense.com/products-detail.asp?cpid=122 double ball bearing cooling fan fan http://www.szdosense.com /products-detail.asp?cpid=123