共板式法兰风管又称无法兰风管，其制作形式比传统的矩形风管加工速度更快捷、更方便、更小的漏风率。其优点是节省材料，减少工程投资；漏风量小，降低能耗，节省运行费用，颇受施工企业欢迎。美国和欧洲等发达国家从九十年代开始采用风管的无法兰连接。

Common-plate flanged air duct is also called non-blue air duct. Its manufacture form is faster, more convenient and less air leakage than the traditional rectangular air duct. Its advantages are saving materials, reducing project investment, small air leakage, reducing energy consumption, saving operating costs, quite popular with construction enterprises. The developed countries in the United States and Europe have adopted flanged connections since 90s.