How thick is the Big Dipper warm air pipe?

20mm. By querying the setting parameters of Suzuki Big Dipper, it shows that the diameter of warm air pipe of Big Dipper is 25mm, and the diameter of water pipe of water tank is 16mm. The "Big Dipper" multi-functional bus jointly developed by Changhe Suzuki Company and Japan Suzuki Company is the crystallization of aviation technology and Japanese technology, and it is the perfect combination of technology and culture.