"Tiny Cooling Fan" supply temperature will be lower, and the top of the chassis to avoid the presence of airflow dead zone. If you are under the power of the chassis, a large windmill fan directly into the wind from the outside of the chassis, power supply will be very cool, is conducive to stable power, long life, but dust will be relatively large; "Tiny Cooling Fan" Power is not very cool , but it will not become cleaner. Some people like to set a large windmill power under the 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. "Tiny Cooling Fan" cooling 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.