"Blower Fan" according to fan pressure, the fan can be divided into low-pressure turbine, intermediate pressure turbine and high pressure air. Pressure ranges are as follows: low pressure: Fan total pressure H ≤ 1000Pa; medium pressure: 1000Pa < H ≤ 3000Pa; high pressure (centrifugal fan): 3000Pa < H ≤ 15000 Pa. Ventilation works mostly by low-pressure and low-pressure turbine. Can be divided into centrifugal fan and axial fan and water "Blower Fan"; hospitals, laboratories, sewage aeration stirring; vacuum feed printing industry; plating tank, industrial waste-water aeration stirring; plastic welding, blowing air supply; burner spray, glass and other industries; divided by technology: the bearing of technical points, "blower Fan" can be divided into general mechanical bearings blowers, blower magnetic levitation, air suspension bearing blower.