Zhangcha connections unique, novel structure, good sealing performance. Easy installation, a short work cycle only traditional galvanized iron sheets duct 1/ 5, the scene changes very convenient.

• 独特的承插式连接,结构新颖,密封性能好。安装便捷,施工周期短只有传统镀锌铁皮风管的1/5,现场改动很方便。