Ventilation  ducts are mainly used in industrial and construction projects, the  application areas are mainly involved: the clean room of the clean room  for the electronics industry, the clean room for the medical and  foodstuffs workshop, hotels, shopping malls, factories and office air  conditioning systems, 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 environmental control with the return air system ...  and so on; PS: often Film and television, animation development into escape and sneak into the special route.