"AC Fan" boiler fan if the inverter is used, and that the fan is running, in the same amount of wind conditions, the power used by the fan is relatively small, if the use of inverter-specific modes of speed control, to reduce it depletion effect, but also make full use of energy, so as not to appear the phenomenon of waste, it can be said is the first advantage of fan and fan drive device as compared to the conventional lies. Inverter means not only can improve energy utilization, but also on the basis of energy, so the effect of adjusting the amount of wind, so since the fan effect will be greatly increased, and this is the place for users who very meaningful.