1. Small size, air volume, low noise, can save energy. 2. Relatively stable operation, ... gas shocks, so blower , the vibration and noise is significantly reduced.1. Using advanced spiral back ... of high pressure shock body, so fans, the noise is significantly lower.2. Rotor the use of ... hardened gears, so that further increase machine life and reduce noise.5. Rotor, cases, wall panels and other key ...