The production of spiral air ducts, as a new type of air duct construction process, has clear benefits: beautiful appearance, high strength, high level of mechanical automation, fast processing and manufacturing speed, and can reduce equipment tasks, greatly increasing task power, etc. Since the emergence of a small number of prosperous countries, significant progress has been made in the processing quality of circular air ducts.

（1）外觀質量高。成形后的風管內壁潤滑，外壁流利；

(1) High appearance quality. The inner wall of the formed air duct is lubricated and the outer wall is smooth;

（2）風管強度大。由于外壁咬口構成的螺旋線棱筋均勻分布，起到一個均勻增強筋的效果，其單元強度大于粗淺咬口式風管；

(2) The strength of the air duct is high. Due to the uniform distribution of spiral ribs formed by the outer wall bite, it has a uniform reinforcing effect, and its unit strength is greater than that of the coarse and shallow bite type air duct;

（3）風管密封功能優勝。由所以機械加工，能減少酬勞操作掉誤，保證風管嚴密，漏風量遠小于現行規范規則值；

(3) Superior duct sealing function. Therefore, mechanical processing can reduce errors in compensation operations, ensure that the air duct is tight, and the air leakage rate is far less than the current standard rules;

（4）資料用量減少。由于螺旋式風管單元強度大于粗淺風管，故同類規范風管所用的卷材厚度能夠減小一個型號，且風管節長比粗淺咬口式風管大，相同長度的風管節口數目清楚減少，加之選用無法蘭聯接，可節省許多原資料；

(4) Reduced data usage. Due to the strength of the spiral air duct unit being greater than that of the coarse and shallow air ducts, the thickness of the coil used for similar standard air ducts can be reduced by one model, and the length of the air duct section is larger than that of the coarse and shallow bite air duct. The number of air duct sections of the same length is clearly reduced, and the use of flange free connections can save a lot of raw materials;

（5）加工速度快、精度高。由所以機械流水線加工，可不受功課手技能程度約束，對行進風管加工質量非常有利。

(5) Fast processing speed and high accuracy. Therefore, the mechanical assembly line processing is not constrained by the skill level of the operator, which is very beneficial for the quality of the air duct processing.

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