1. When making the air duct, according to the design size, the side interface of the air duct is cut on the main air pipe, and the opening dimension connected with the upper and lower plates of the air support is a supporting air pipe, and the inner wall dimension is increased by 6mm. The opening dimension at the connection of the left and the right plates of the branch pipe is the outer wall dimension of the branch duct, and the 45 DEG diversion angle is arranged in the downwind direction, and the length of the diversion angle shall not be less than 1/2 of the width of the draft pipe.
2, make the rectangular pipe, commonly used by some methods into small plates made of concentric arc and line pipe and straight duct mouth made successive dislocation connection form。
3,. When making the three pass (Butterfly three pass), draw the two flat panel size according to the drawing size, and cut the material.
4, the branch air pipe and air pipe connected on the plate is cut into Tijie shaped, ladder shaped cutting plate is not around. Then, the air duct is inserted into the main air duct, glued with a special adhesive, and then bundled with a belt to clean the remaining glue, fill the gap, and put it in the smooth place.
5, the rectangular air duct's reducing tube has two sides, one side eccentric and 60 sided eccentric, and the angle of the reducing diameter of the one-way reducing pipe is less than 30 degrees, and the angle between the two sides of the reducing pipe is less than 10 degrees.
6. The manufacture of the warp air duct is the same as that of the direct air duct. One or three sides of the air duct plate are inclined. The length of the variable air pipe shall not be smaller than the long side of the big head and the difference between the long side and the small end.
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