The performance parameters have a direct impact on the "Small Cooling Fan" of the air flow. Within the allowable range, the larger diameter of the fan, the greater the amount of wind, the greater the role of surface wind. Usually reserved for the mainframe is installed 8cm × 8cm position axial "Small Cooling Fan". For the indicators that should be selected fan caliber must be coordinated with your own computer chassis structure to ensure "Small Cooling Fan" does not affect the normal operation of a computer other equipment, as well as to ensure that the computer chassis has enough free space for easy removal other accessories.