Noise level "220V Cooling Fan" operation generated when the work, according to the fan speed is different, the noise may come from the air, the sound of wind shear or motor and electronic components themselves. A typical wind shear noise including air turbulence caused by the blade, as well as interaction between the rotor and the stator modules. Noise "220V Cooling Fan" motor or electronic components per se, usually occur at low speed state, but in the consumer market, customers are very sensitive to the sound. In order to create a low-noise "220V Cooling Fan", it must be combined with a variety of expertise and make good use of sound equipment and instruments related to the various stages of research and development to a variety of science and technology to gradually reduce the noise level.