The round fabric air duct has the best fluid mechanics characteristics, the duct resistance is small, and no vortex is generated during the air flow transmission process, which can reduce the noise generated during the air supply process, and the air supply is quieter and more comfortable. Compared with the rectangular duct with the same cross-sectional area, it can save a lot of materials. The circular Farui duct has a generous appearance, simple and beautiful, and the Farui duct has a variety of colors, which makes it easier to integrate with the indoor environment. It is suitable for places with large cooling capacity and air supply volume and sufficient installation space.