In fact, every "Micro Cooling Fan" manufacturers have their own fan design approach, each design method are also after a large number of experimental data obtained, we can say very high complexity. For specific technical issues that this article is no longer in-depth discussion. "Micro Cooling Fan" bearing good fan, in addition to its high air volume and pressure outside their reliability is very important, which, bearing play "Micro Cooling Fan" use of a very important role. General speed fan uses ball bearing (ball bearing),