"220V Cooling Fan" speed it will bring greater noise when the speed has reached the limit, to increase the amount of wind, the only way to change the angle of the blade or vane increase, the number of blades is proportional relationship between the amount of wind. But "220V Cooling Fan" fan number is not possible, be based on the needs to consider the amount of wind pressure, high volume windy blades while the fan noise will naturally increase; in short "220V Cooling Fan" in all Computer accessories belonging to a class of humble. but necessary. An excellent performance of the cooling fan can satisfy the needs of computer hardware cooling. Became the patron saint of the stable operation of the computer.