It is behind the fan and cooling fins row, so they need big fan pressure penetration, in order to better heat away. The rear of the front panel of the chassis fan is responsible for providing the cold air inside the chassis. Most chassis panel consisting of at least one surf the web baffle design, and "220V Cooling Fan" for the hard disk cage rear position. It requires a large pressure type of fan can blow through the front of the chassis, which will inject a steady stream of cold air inside the chassis. The inclination angle of the fan blades and blade curvature of the two factors that affect the value of a fan pressure in large city. The inclination angle of the blades and the greater curvature values, at the same rotational speed, the greater the pressure supplied. This "220V Cooling Fan" is particularly suitable for use in the front of the chassis, as the intake fan to use. For CPU cooler for cooling fin area and density row determines the cooling effect, of course, there is also inseparable "220V Cooling Fan".