"Blower Fan" different ways can be adjusted to achieve the same purpose, but the energy saving effect varies. According to the theoretical analysis and proved that can be drawn from the following four aspects of the conclusions. For blowers and compressors, the meter adjust the way up to power consumption. Despite the relative flow Qr (actual flow rate Q and Q0 design flow ratio) is decreased, power is also reduced accordingly. For example, when Q = 0.65 Q0, the corresponding power is reduced to about 80% of the original, but compared with other regulation mode, energy consumption continued to hold first place.