The ventilation pipe manufacturer stated that the provisions for the connection of metal air ducts include: the seam of the air duct plate splicing should be staggered, and there should be no cross seam; When the air duct is connected by flange, if the flange material specification and bolt specification are higher than the specification, the material will be wasted to a certain extent. If the flange material specification and bolt specification are lower than the specification, the tightness and strength of the connection will be difficult to be guaranteed, and the material specification used should comply with the relevant provisions.

金属风管的连接方式主要有4种，分别是：抱箍式连接、抱箍式连接、插条式连接和软管式连接，其中抱箍使用于圆通风管和螺旋通风管连接，抱箍式是圆形和矩形的链接使用，插条式用于矩形连接，软管式的用在风管和部件之间的连接。

There are four main connection methods for metal air ducts, namely, hoop type connection, hoop type connection, strip type connection and hose type connection. The hoop type is used for the connection of round ventilation ducts and spiral ventilation ducts, the hoop type is used for circular and rectangular connection, the strip type is used for rectangular connection, and the hose type is used for the connection between air ducts and components.

金属风管连接应注意1、将部件和设备连接到负载空气管时，须安装单独的支架和吊架，而支架和吊架不能用作空气管的吊架，距排气、空气阀和自动控制机构的距离大于200mm。

Attention shall be paid to the connection of metal air duct. 1. When connecting components and equipment to the load air duct, separate supports and hangers must be installed. The supports and hangers cannot be used as hangers for air ducts, and the distance from the exhaust, air valve and automatic control mechanism is greater than 200 mm.

2、风道应垂直安装，支架之间的距离不应超过2.4m，每个立管上的支架数量少应为2，支架与风道之间的接触面积应适当增加。3、如果水平悬挂的主风管的长度超过20m，则应安装防抖固定支架，每个系统应安装两个。

2. The air duct shall be installed vertically, the distance between supports shall not exceed 2.4m, the number of supports on each riser shall be at least 2, and the contact area between supports and air duct shall be increased appropriately. 3. If the length of the horizontally suspended main air duct exceeds 20m, anti shake fixing brackets shall be installed, two for each system.

4、通风管道厂家表示空气管和空气管之间的管道部分通过特殊的法兰连接器连接，插入插件后，用密封胶将空气管四个角上的其余孔紧密密封，并安装这些角。5、连接复合空气管和法兰阀零件、设备等时，请使用满足要求强度的F型或4型专用接头，并在接头和法兰之间使用密封性能良好且挠性高的垫圈。连接部分和法兰应平整无缺点，不应有明显变形，固定螺栓之间的间隙不应超过100mm，法兰的四个角应有螺栓孔。

4. The manufacturer of the ventilation pipe said that the pipe between the air pipe and the air pipe is connected by a special flange connector. After the plug-in is inserted, the remaining holes on the four corners of the air pipe are tightly sealed with sealant, and these corners are installed. 5. When connecting the composite air pipe and flange valve parts, equipment, etc., please use F or 4 type special joints that meet the required strength, and use gaskets with good sealing performance and high flexibility between the joints and flanges. The connecting part and flange shall be flat without defects and obvious deformation. The clearance between fixing bolts shall not exceed 100mm. Four corners of the flange shall have bolt holes.

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