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Vacuum Pump improved by raising the intensity in order to prevent cent rotor and axis deviation from external influences. Features: 1. Lower noise：Pressure pluses are the major noise source in blowers. The Trundean roots blower design can efficiently reduce noise by approximately 5 dB. 2. Lower energy consumption：Trundean roots blower are designed to control backflow pressure to the rotor in order to reduce energy consumption. 3. Longer bearing life：Less vibration transmitted through the lobe results approximately 20% longer Fore more information and pictures, please visit: www.bestrootsblower.com