... life 5.High efficiency, big air volume Specification:Roots fan is widely used in wastewater treatment, aquaculture, pneumatic conveying ... , vacuum packing, coal washing, combustion and pressurized, casting, mining, metallurgical, chemical industry, light industry, building materials, electricity, flour ... 22kw yuan/setmotorHER200L 30kw yuan /setmotor Aeration fan/fan/Aquaculture fan