SRE power chassis using a large windmill "Mini Air Cooling Fan" timely sucked the heat of the CPU, but also make their own temperature; small fan supply temperature will be lower, and will avoid the presence of airflow dead zone at the top of the chassis. 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; "Mini Air Cooling Fan" Power will not be 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 "Mini Air Cooling Fan" a large number of openings will supply chassis air duct design brings some inconvenience, need special attention. Industrial cooling equipment must be products, including now the phone is the same, the cooling effect is particularly vulnerable to bad crash.