Some people like the "24V DC Cooling Fan" supply anti-wear, are interested can try. For fanless power supply, the positive pressure in the duct of the chassis, most of the heat will be discharged to the outside of the chassis; suction duct within the chassis, most of the heat will be discharged to the chassis. And a large number of openings fanless power supply chassis air duct design will bring some inconvenience, need special attention. "24V DC Cooling Fan" is industrial equipment necessities, including now the phone is the same, the cooling effect is particularly vulnerable to bad crash, here's a look at the fan used in the Apple phone. DC fan vibration is the best solution in the open mold, the mold so that sufficient precision, balance the blades do the best remedy is followed by the production of a balance on targeted in "24V DC Cooling Fan" fan increase in the removal of some of the excess compound. For the shaft and bearing friction problem, adjust the size of a DC fan assembly on it.