Greatech Silent Roots Blower
Model: SdB40, SdB50, SdB65, SdB80, SdB100, SdB125, SdB150
Bore Size: 0.1 to 6 inch (40mm to 150mm)
Air Flow: 0.1 to 22 cmm
Pressure: 0 to 600 mBar
As Vacuum: 0 to -500 mBar

Advantage:
Extremely low noise
Power Saving
High Efficiency
Fully Cooling
Oil Changing: Once a year
Space Saving
No Need Belt
No Need Foundation Plateform
Easy Maintenance
Easy Installation 
Especially suitable to install in Hospital, School, Hotel, Housing Area, Building .....etc. where is prohibited noise