The inner and outer surfaces of cold-rolled steel flange ventilation ducts and the internal heat transfer materials are firmly bonded, which is one of the basic standards to ensure composite materials. The defects of furniture boards with a total area exceeding a certain amount not only endanger the service life of the air duct, but also sometimes reduce the actual effect of its thermal insulation. Therefore, the defects shall not exceed 6 ‰, so as to achieve the normal application of materials in system software.

传统式的通风空调工程风管横着联接，均选用扁钢做成成对法兰，各自铆在风管两边并反边，运用二根风管的这对法兰，正中间再加上密封垫片并且用地脚螺栓把她们相互连接。因为受材料、机器和作业的限定，风管不太可能为降低这类连接头做得较长。

The traditional ventilation and air conditioning project air ducts are connected horizontally. Flat steel is used to make a pair of flanges, which are riveted on both sides of the air duct and opposite sides. This pair of flanges of two air ducts are used, with a sealing gasket in the middle and anchor bolts used to connect them. Due to the limitation of materials, machines and operations, it is unlikely that the air duct will be long enough to lower such connectors.

生产流水线机械自动化、自动化技术水平高，进一步提高了制做效率及其风管的制做精密度。

The production line has a high level of mechanical automation and automation technology, which further improves the manufacturing efficiency and precision of air duct manufacturing.

风管开创法兰，风管净重，镀锌铁风管加工厂家，与传统式角钢法兰较为，节省了法兰槽钢及联接地脚螺栓，降低材料耗损。管段长度大于1250mm或低压风管单侧平面积大于1.2mm，中高压风管大于1.0mm，应采用加固方法。质量控制关键风管与法兰铆接前应进行技术质量审查，管段应留出10mm翻边量。连接法兰铆钉时，有必要将铆钉线垂直于板面，使铆钉头压紧板材，使板缝紧密。

Compared with traditional angle steel flange, the air duct creates flange, net weight of air duct, and galvanized iron air duct processing factory, saving flange channel steel and connecting anchor bolts, and reducing material consumption. If the length of the pipe section is greater than 1250mm, or the flat area of one side of the low pressure air duct is greater than 1.2mm, and the medium and high pressure air duct is greater than 1.0mm, the reinforcement method shall be adopted. Before riveting the key air duct and flange for quality control, technical quality review shall be carried out, and 10mm flanging shall be reserved for the pipe section. When connecting flange rivets, it is necessary to make the centerline of the rivet perpendicular to the plate surface to make the rivet head press the plate tightly and make the plate seam tight.

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