Greatech Silent Tri Lobe Blower Bore Size: 40mm to 150mm Air Flow: 0.1 to 22 m3/min Pressure: 0 to 0.6 bar Advantage Tri-Lobe Roots Blower Extremely low noise Electric save at least 20% Extremely low vibration, almost no shaking Extremely High Efficiency Gear oil change once a year or even longer Fully cooling including gear box Verticla design, space save 50% Coupling driven, no need to change and adjust belt Easy installation Easy maintenance. By wooden case.