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Roots Blower (Compressor) Vacuum Pump (NSRH). High Efficiency Design: New impeller lines improve adiabatic and volumetric efficiency, reducing heat generation and temperature rise. Wide Pressure Range: Pressure rise capability spans from 9.8kPa to 78.5kPa (up to 1kgf/cm2) in dry state. Efficient Drive System: Equipped with motor drive and belt connection for reliable operation.