As long as "220V AC Cooling Fan" fan identified physical size, structure, various properties all determined by speed. Speed can affect wind speed, wind, air pressure, noise, power, and even life. The higher the speed, the stronger the fan performance, that the faster the wind speed, the greater the amount of wind, the greater the pressure; at the same time, "220V AC Cooling Fan" high speed, friction, vibration much noise large, life bearings and other wear and tear equipment Zhu short; speed increases, the motor power consumption increase is the inevitable result. Fan Shu product does not count indicate wind, air pressure, it will indicate the rated speed; some of the various "220V AC Cooling Fan" is more familiar with the players according to a fan of sizes, shapes, and fan speed Fu break out of it performance.