"Cooling Fan Manufacturer" by DC voltage and electromagnetic induction, the electrical energy into mechanical cooling fan blades so as to drive the rotation, this rotation has become a fan in DC fan. For this reason some "Cooling Fan Manufacturer" manufacturers in the dust also style all their own. For example, some of the market vendors "Dust Network" fan mounted on the outside, but must be cleaned regularly, otherwise blocking cold air filter will cause unnecessary trouble cooling. There are a number of new products introduced so-called dust-proof design, the "Cooling Fan Manufacturer" fouling of the shaft to the vicinity of the closed state, while optimizing the wind into the wind, so that dust nowhere to hide. Can significantly increase fan life, to use more at ease.