Install and use spiral duct to save money

In order to save labor and raw materials, the construction unit can calculate the spiral air ducts of various specifications and models, and when dividing by the length of the ventilation air duct, pay special attention to reducing the length of other pipes, such as tee, electric air valve, elbow, There are many ways to install spiral ducts. When ordering, you must first determine the connection method, then select. Connection methods include: looper flange method and sleeve method. It is installed by the looper flange method, and the size of the ventilation duct is the same as that of the accessories.