Fan selection
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Fan requirements: outlet pressure of 400 mbr, air volume of 1200 cubic meters per hour; for long-term operation, is a Roots blower or a high-pressure blower more energy-efficient?
You can ask the manufacturer; they usually provide a very detailed response
This pressure Roots type has greater overall advantages
A high-pressure blower is a type of vortex blower; a single unit cannot achieve such parameters.
I have consulted several fan manufacturers, and they can do it.
Manufacturers will only produce one type of product and tend to criticize other products, which is not very objective.
The Sanniu Roots blower model is NSR150II, with a power output of 22 kilowatts