USA technology bi lobe air blower/roots blower/rotary blower High Efficiency Bi-lobe Rotor /Integrl-Shaft Ductile Iron Impeller MB Blowers with bi-lobe are heavy duty style, and the technology is from America.It is the replacement for Duroflow models of Gardner Denver and RAM/RCS models of Dresser Roots.Features:High efficiency bi-lobe rotorNoise-reduction know-how application for casingIntegral- ...