Yang Yi-fan is the kind of low-power, low noise, energy-saving fan is controlled from the sound source, starting with improving the efficiency of the flow, supported by rational design of the overall structure of the cluster of cases with low noise and the induction motor, A functioning stable, low noise, high efficiency, energy-consuming province, and other characteristics, widely used in mine enterprises, civil construction, metallurgy, power stations and other places of work unaspirated the ventilation and storage.