Ventilation duct is a kind of ventilation and air conditioning engineering, which is made of metal, non-metal sheet or other materials. It is mainly used for air circulation. In some large places, ventilation duct has a wide range of applications, mainly in industrial and construction engineering, hotel, hotel, shopping mall, factory and office building central air conditioning system. Xiao Bian summarized the performance index of Shandong ventilation pipeline for you, looking forward to your attention.

1、工作压力：系统风管总风管处设计的大的工作压力。

1. Working pressure: the large working pressure designed at the main air duct of the system.

2、允许漏风量：按风管系统类别所规定平均单位面积、单位时间内的大允许漏风量。

2. Allowable air leakage: large allowable air leakage per unit area and per unit time according to the category of air duct system.

3、漏风量：通风管道系统中，在某一静压下通过风管本体结构及其接口，单位时间内泄出或渗入的空气体积量。

3. Air leakage: the volume of air leaked or infiltrated per unit time through the structure and interface of the air duct body under a certain static pressure in the ventilation duct system.

济南通风管道强度高、刚性好，通风阻力小，适应于各种领域。为了保障工业及民用建筑的正常通风，通风管道必须满足高性能、长使用寿命的要求，这对其加工材质就有了较高的要求。一般钢板、镀锌板、不锈钢材质在通风管道制作中比较常用。如果你想对通风管道进行更深入的了解，欢迎经常来访本站。

Jinan ventilation pipeline has high strength, good rigidity and small ventilation resistance, which is suitable for various fields. In order to ensure the normal ventilation of industrial and civil buildings, the ventilation pipe must meet the requirements of high performance and long service life, which has higher requirements for its processing materials. General steel, galvanized steel, stainless steel materials are commonly used in the production of ventilation pipes. If you want to have a deeper understanding of ventilation ducts, you are welcome to visit our website frequently.

济南通风管道制作前的准备工作：

The preparation work before the manufacture of Jinan ventilation pipe is as follows

1、制作风管前，首先要检查采用的材料是否符合质量要求，是否有出厂合格证明书或质量鉴定文件。若无上述证明文件则应进行外观检查，并应符合下列要求：

1. Before making air duct, it is necessary to check whether the materials used meet the quality requirements and whether there are factory certificates or quality appraisal documents. If there is no such certificate, visual inspection shall be conducted and the following requirements shall be met:

(1)板材表面应平整，厚度应均匀，无凸凹及明显的压伤现象，并不得有裂纹、砂眼及、刺边和锈蚀情况;

(1) The surface of the plate shall be flat, the thickness shall be uniform, and there shall be no convex concave and obvious crush, cracks, sand holes, burrs and corrosion;

(2)型钢应该等型、均匀，不应有裂纹、气泡、窝穴及其它影响质量的缺陷;

(2) The section steel shall be of equal shape and uniform without cracks, bubbles, pits and other defects affecting the quality;

(3)其它材料不能因具有问题导致成品强度的降低或影响其使用效能。

(3) Other materials should not reduce the strength of the finished product or affect its use efficiency due to problems.

2、风管和配件表面平整、圆弧均匀、纵向接缝应错开;咬口缝应紧密，宽度均匀。焊缝应作外观检查，不应有气孔、砂眼、夹渣、裂纹等缺陷，焊接后钢板的变形应矫正。

2. The surface of air duct and accessories shall be smooth, the arc shall be uniform, and the longitudinal joints shall be staggered; The bite joint shall be tight and uniform in width. The weld shall be inspected visually, and there shall be no air hole, sand hole, slag inclusion, crack and other defects. The deformation of steel plate after welding shall be corrected.

3、制作金属风管和配件，外径或外边长的允许偏差，其中制作法兰，圆形法兰内径或矩形法兰内边尺寸允许偏差为+2㎜，不平度不应大于2㎜。

3. The allowable deviation of outer diameter or outer edge length for manufacturing metal air duct and fittings is + 2mm for manufacturing flange, inner diameter of circular flange or inner edge size of rectangular flange, and the unevenness shall not be greater than 2mm.

4、风道系统内所有直角转弯处均安装消声弯头，消声弯头内设镀锌铁板导流片。

4. All right angle bends in the air duct system are installed with silencing elbows, and galvanized iron sheet deflectors are set in the silencing elbows.