Duct is mainly used in industrial and construction projects, the application areas are mainly involved: the electronics industry clean room purification system, pharmaceutical and food aseptic workshop purification system, hotels, shopping malls hospitals, factories and office of the central air-conditioning system, 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