Many times "AC Fan" users will find that the impeller always consume energy in vain. Forming gas leak reincarnation activities via the front cover and the current collector between. Must be maintained between the front cover and the current collector is a gap, centrifugal machine and cabinet and ventilation shaft. In order to ensure the reliability of the fan rotation. This can mitigate this phenomenon to a large extent. Centrifugal fans using the most common problem is the fan vibration, and you want to solve this problem fundamentally is not a simple matter, but if you reduce the fan speed is a very good way, but the effect of this approach is also the most significant. However, users still need to use the fan according to the specific situation to determine exactly what method can be more reasonable.