1.Low noise 2.Extensive use 3.Reasonable structure, small volume 4.long life 5.High efficiency, big air volume ... , flour, sandblasting, vacuum, etc.Standard accessories:General base, belt cover, blower pulley, motor pulleys, "V" belt, import and export muffler (with ... bolt, non-return valve and elastic joints, lubricating oil. roots blower/ fans/ventilation equipment