In the process of duct production, various types of duct processing equipment must be used, which is also determined according to the type of duct to be produced. Whether these duct processing equipment can efficiently produce high-quality duct, or to do a good job of equipment inspection in advance.

1、確保設備部件的接縫都要嚴密不漏風；清洗系統風管內表面，必須平整光滑，嚴禁有橫向拼接縫和管內設加固或采用凸棱加固的方法。

1. Ensure that the joints of equipment components are tight without air leakage; The inner surface of the air duct of the cleaning system must be flat and smooth, and it is strictly forbidden to have transverse joints and reinforcement in the duct or to use convex edge reinforcement.

2、風管咬縫要緊密、寬度均勻，無孔洞、半咬口和脹裂等缺陷。直管縱向咬縫錯開；風管折角平直，圓弧均勻，兩端平面平行無翹角，表面凹凸不超過10mm；風管與法蘭連接牢固，翻邊平整，寬度要大于6mm。

2. The biting seam of air duct shall be compact, uniform in width, and free from defects such as hole, half biting and expansion crack. The longitudinal seam of straight pipe is staggered; The bending angle of the air duct is straight, the arc is uniform, the planes of the two ends are parallel, and there is no warping angle, and the concave convex surface is not more than 10 mm; The connection between the air duct and the flange shall be firm, the flanging shall be smooth, and the width shall be greater than 6 mm.

3、風管法蘭螺栓和鉚釘的孔間距不要超過150mm，焊縫處不設螺孔，螺孔有互換性；不銹鋼板和鋁板風管表面沒有很明顯的痕跡，復合鋼板風管表面不存在破損的情況。

3. The distance between the holes of the bolts and rivets of the air duct flange shall not exceed 150 mm. There shall be no screw holes at the welding seam, and the screw holes shall be interchangeable; There is no obvious trace on the surface of stainless steel plate and aluminum plate air duct, and there is no damage on the surface of composite steel plate air duct.

風管加工設備結構是否完好、功能是否齊全等，都是影響風管成型的重要因素。所以在生產之前就應該調試好，保證加工過程的順利進行。

Whether the structure and function of the air duct processing equipment are in good condition or not is an important factor affecting the air duct forming. So before the production should be debugged to ensure the smooth processing.

風管，是用于空氣輸送和分布的管道系統。有復合風管和無機風管兩種。復合風管以Durkduct風管為代表。可按截面形狀和材質分類。風管制作不銹鋼風管制作是在咬口縫、鉚釘縫、法蘭翻邊四角等縫隙處涂上密封膠（如中性玻璃膠）。涂密封膠前應表面塵土和油污。按截面形狀，風管可分為圓形風管，矩形風管，扁圓風管等多種，其中圓形風管阻力小但高度尺寸大，風管加工制作復雜。所以應用以矩形風管為主。按材質，風管可分為金屬風管，復合風管，高分子風管。

Air duct is a pipe system used for air transportation and distribution. There are two kinds of composite duct and inorganic duct. The composite duct is represented by durkduct duct. It can be classified by section shape and material. The production of stainless steel air duct is to apply sealant (such as neutral glass glue) on the seam of undercut seam, rivet seam and flange flanging. Dust and oil on the surface shall be removed before applying sealant. According to the cross-section shape, the air duct can be divided into circular air duct, rectangular air duct, oblate air duct and so on. Among them, the circular air duct has small resistance but large height and size, and its processing is complex. So the application is mainly rectangular duct. According to the material, the air duct can be divided into metal air duct, composite air duct and polymer air duct.