... sewage treatment, smelting furnace, coal preparation plant, mine floatation, vacuum industry, etc. Main Features1. Compact structure, elegant appearance, ... prolonged bearing service life.9. Bearing temperature alarm10. Blower and motor connected by coupling, other connection methods available ... 20~250 m3/min2. Discharge pressure: 1000-10000mmH2O3. Vacuum: -800--5000 mmH2O Multi-stage centrifugal blower