The DD fan impeller is the supporting product of low-noise multi-blade centrifugal fan with the characteristics of stable-operation, low noise, large flowing rate, small vibration and long service life, which is widely used in work unit cafeteria, hotel & restaurant, eating house and kitchens of other public places for fume-extracting and air-supplying, and is adapted for use in production facilities such as grain machinery, chemical machinery and plastic machinery. The product is widely used and has high adaptability.  http://www.blower-wheel.com