Different hoses have different structure, let us find out what are the ventilation pipe structure?
Air inlet connection
Usually we need to change the inlet pipe of the centrifugal fan in diameter.That is, the circular cross section becomes a rectangular cross section. And through a 90° elbow. Because the inlet of the centrifugal fan is mostly made of circular tubes. And in the ventilation piping system, the circular tube occupies a larger space than the rectangular tube. And at the same time, the circular tube occupies a larger space. The 90° elbow is more difficult to manufacture than the rectangular 90° elbow, and the technical requirements are higher. Therefore, in many cases, the inlet pipe of the exhaust fan is made into a rectangular 90° elbow. In order to connect with the inlet pipe of the exhaust fan, a transition joint from circular to rectangular must be made between the circular pipe and the rectangular pipe
Air outlet connection
When we change the direction of the outlet pipe of the centrifugal fan. It is best to be consistent with the flow direction of the air in the extension unit. When the outlet pipe joint length is short and the radius of curvature is small.We should install the deflector in the elbow
The shape and size of the elbow
The shape and size of the 90° rectangular elbow. The minimum inner curvature radius shall not be less than the pipe diameter, and the minimum external curvature shall not be less than the pipe diameter