How to save ventilation fans electricity

If you want to save ventilation fans electricity,you can do as following.

1.try to minimize the resistance of pipelines , rational selection of pipe size and location, installed imported the collector.
2. Controling your washroom and leaf top of radial gap value.
3. Reasonable fan model choice. Don't make the fan in the area for low efficiency
4. such as single impeller should be match for fan motors of the right, otherwise, it will lead  load phenomena.
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