Fan bearing system:

It is generally recommended to use ball bearings for the fan bearing system, because the life of the fan heat fan usually depends on the reliability of its bearings. The ball bearing system has been proven to have the characteristics of high efficiency and low heat generation. Ball bearings are rolling friction, rolling by metal balls, the contact surface is small, and the friction coefficient is small; while oil-impregnated bearings are sliding friction, the contact surface is large, after long-term use, the oil will evaporate,