We Greatech is a professional Roots Type Blower manufacturer in Taiwan, we are specialized in producing of:
(A)Tri Lobe Positive Displacement Blower and Vacuum Pump(Roots Typ Blower)
Bore Size: 40 to 350 mm (1.5-14 inch)
Air Flow: 0.1 to 280 m3/min
Pressure:0 to 2 Bar
As vacuum pump: up to 5000 mmAq gauge vacuum
Model: G40, G50, G65, G80, G100, GM125, G125, GM150, G150, G200, G250, G300, G350
(B)Silent Roots Type Blower and Vacuum Pump
Bore Size: 40 to 150mm (1.5 to 6 inch)
Air Flow: 0.1 to 28 m3/min
Pressure: 0 to 8000 mmAq
Model: SdB40, SdB45, SdB50, SdB65, SdB75, SdB80, SdB90, SdB100, SdB110, SdB125, SdB150, SdB160
Advantage:
Tri. Lobe
Extremenly Low Noise,
Power Saving, Oil Saving,
Space Saving, High Efficiency
Air Cooled for Whole Blower,
Extremely Low Vibration,
Easty Maintenance,
Easy Installation ... 
Taiwan