... big air volume Specification:Roots fan is widely used in wastewater treatment, aquaculture, pneumatic conveying, vacuum packing, coal washing, ... , building materials, electricity, flour, sandblasting, vacuum, etc.Standard accessories:General base, belt cover, blower pulley, motor pulleys, "V" belt, ... , non-return valve and elastic joints, lubricating oil. roots blower/ fans/ventilation equipment