Clean bench is one kind of working table which can supply partially clean & sterile environment. It is widely used such research and manufacturing departments as medical and health, biopharmaceutical, food, medical science experiment, optics, electronics, aseptic laboratory experiment, aseptic microorganism test, plant tissue culture ,etc. It can also be connected to the assembly line with advantages of low noise & mobility .It is a kind of air filtration equipment with universal use, which can provide partial high cleanliness working environment. It has good effect on improving process conditions, product quality and increasing finished product rate.