... widly used in wastewater treatment, cement, pneumatic conveying, chemical, metallurgy, aquaculture,electricpower,mining,etc. Roots Blower (high pressure type)1,low noise, spiral structure ... reduce the noise efficiently. 2,stable ruuning, realized by the special design of rotor. 3,high efficiency and low energy consumption4 ... usage cost and convenient for the customer. Roots blower high pressure type