AC Fan is AC cooling fan, EC fan and DC fan is DC cooling fan, but there is a difference between DC, EC is AC, it is the AC to DC, is the new product of the fan industry. The EC fan breaks through the limitation of the frequency of the traditional AC fan, has a wide range and has the protection of blocking rotation. In terms of parameters, the power consumption of the DC fan is much less than that of the AC fan, and the rotational speed that the EC fan can achieve is also much less than that of the AC fan, but it's more expensive than an AC fan. EC Fan easy to operate, low noise, control speed is higher, with AC Fan cost-effective ratio to high. AC FAN INPUT AC fan, power frequency is fixed, AC fan speed is determined by power frequency, the higher the frequency is, the faster the magnetic field switching speed is, the higher the speed is, but the frequency can not be too fast, too fast will cause activation difficulties. AC in the price above will be more affordable, low cost, but the fan of high power, low speed, small air volume, generally used in need of stable, stable air volume equipment. The above is the difference between EC FAN and AC fan, if you want to know more about cooling fan, please click:http://www.dxymotors.com