11-62A series multi-vane centrifugal fans with low noise are developed in order to adapt to the requirements from the development of purification industrial and environmental noise reduction. The fans adopt the multi-purpose optimized design schemes in aspect of noise, efficiency and various pneumatic parameters. They fulfill the finest overall frame performance matching and good pneumatic performance. The impeller has been supplemented with strict static, dynamic balancing correction. Therefore it has the features such as stable running, low noise, small vibration, long life and so on. The fans are widely used for kitchen air exhaust, lampblack exhaust and ventilation in public such as canteen, hotel and food shops. They are also used in some producing equipments, like grain machinery, chemical machinery and plastic machinery.