... .long life 5.High efficiency, big air volume Specification:Roots fan is widely used in wastewater treatment, aquaculture, pneumatic conveying, vacuum ... , etc.Standard accessories:General base, belt cover, blower pulley, motor pulleys, "V" belt, import and export muffler (with air filter), relief ... .5kw yuan /setmotorHER200L 22kw yuan/setmotorHER200L 30kw yuan /setmotor Aeration fan/fan/Aquaculture fan