"Cooling Fan Manufacturer" are put in order to reduce the noise of some design, such as changing the angle of the blades, to increase lubricity and stability of the fan shaft and the like. When we use lubricating bearings, due to the long running time is not very easy to cause the machine to overheat and crash phenomenon, there may be serious when the movement burned. To this end, there are many good brands of "Cooling Fan Manufacturer" are beginning to use the ball, which is the use of a number of ball bearings to reduce friction as a medium. This ball bearing cooling fan is characterized by wind, long life, low noise, but the cost is relatively high, however, it is possible to use only high-grade fan to it, but for the average fan, although called "bearing", but just bush bearing, that is, from the copper jacket and a steel shaft composed, and the "ball" But the heat completely different things. In addition, "Cooling Fan Manufacturer" would like to stress here that it is, to have a smooth rotation of the cooling fan, otherwise it is prone to noise, so when we buy cooling fan, cooling fan must also remember to check the roller axis is loose .