"Blower Fan" if relatively little change in traffic when (or adjust the depth of hours), several ways to adjust the power consumption is not very different. That adjustment method has little effect on the energy-saving effect, even not only energy saving, but because of the presence of adjusting means more consumption of power (such as a fluid coupling). In general, the greater the depth adjustment, energy saving effect is more significant. Therefore, to choose carefully adjust the way, in order to obtain the maximum benefit.