"220V Cooling Fan" the inclination angle of curvature of the blades and the blades of two factors largely affect a fan's pressure value. 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. 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 the fan behind the hard drive cage position. It requires a large pressure type of "220V Cooling Fan" can blow through the front of the chassis, which will inject a steady stream of cold air inside the chassis. For CPU cooler for cooling fin area and density row determines the cooling effect, of course, there is also inseparable from the fan. It is behind the fan and cooling fins row, so they need big fan pressure penetration, in order to better heat away.