Duct for non-metallic material (fiberglass duct, fiberglass duct, duct polyurethane, phenolic duct, etc.), the central air duct cleaning equipment to add attachments. Small, lightweight nozzle diameter of 3.5 cm, a fixed, rotating, before blowing, and blow other forms. High-pressure air nozzle and the hose connection, the driving force generated by the high-pressure air into the duct, the nozzle is "cut brush"-type, high-pressure narrow jet of air from the mouth around the exhaust nozzle to form a so-called "air knife", with a unique aerodynamic techniques, this "air knife" in the high-pressure air spray nozzle when you can, such as "magnetic levitation" as posted by the automatic "position" in the duct wall high-speed rotation, the formation of 10 cm wide cut brush surface, 8 kg per square centimeter power cut brush along the wall "cut brush" dirt, to achieve effective cleaning purposes.