Ventilation  ducts are mainly used in industrial and construction projects. The main  areas of application are: clean-up system of clean room for medical  industry, aseptic workshop of medical and foodstuffs, hotels, shopping  malls, factories and office buildings, industrial pollution control Dust,  smoke, oil and other exhaust pipe, industrial environment or post  comfortable with the air duct, coal mine gas drainage gas drainage  system, coal mine environment control with the return air system ... and  so on; PS: often Film and television, animation development into escape and sneak into the special route.