The South Air duct is an air distribution system woven by special fabric fibers, and the unique air outlet mode of fiber penetration and permeation and nozzle jets achieves an average air delivery end system. It is used as an air distributor at the end of the air conditioner. In the world's frozen food industry in the 1960s and 1970s, in order to meet the special requirements of large cooling capacity and low wind speed in the refrigeration area, HVAC engineers from various countries tried to make air outlets with ordinary cotton fiber fabrics and look like cloth bags (SOCKS). In China in the 1950s and 1960s, there were many cases of installing fiber fabric ducts in the refrigeration and refrigeration industry. For more than 20 years, following the continuous innovation of the world's fiber material technology and textile technology, more and more fibers with special functions have been made into air distribution systems, which has continuously expanded the application fields of fiber fabric air distribution systems. According to the market, there is a ventilating system model with a relatively large share. Mainly have the following advantages: 1. Face-style air outlet, large air volume, no blowing feeling. Two; the overall air supply is evenly distributed. Three; anti-condensation. Four; easy to clean and maintain, healthy and environmentally friendly. Five; beautiful and high-grade, diverse colors, personalized convex. Six; light weight, the roof load is negligible. Seven; The system runs quietly and improves the environmental quality. Eight; The installation is simple and the engineering cycle is shortened. Nine; Flexible installation and reusable. Ten; The system cost is fully saved, and the performance-to-price ratio is high.