... 3.Reasonable structure, small volume 4.long life 5.High efficiency, big air volume Specification:Roots fan ... , aquaculture, pneumatic conveying, vacuum packing, coal washing, combustion and pressurized, casting, mining, metallurgical, chemical industry, light industry, ... belt cover, blower pulley, motor pulleys, "V" belt, import and export muffler (with air filter), relief valve, pressure gauge, anchor ...