The primary ventilation system has two methods in the calculation of equipment, one is the drawing method, the other is the transformation method. This time, we will talk about the application of transformation methods. This time, the main focus is on the matters needing attention in the operation of air duct and air valve in ventilation system.

　　一、風管的辨認

　　Identification of air ducts

　　關于鄭州風管加工的轉化之前，有一個內容要求先清楚，那就是關于風管的標高。用高度調整指令檢查時，有時顯示出來的效果不一樣。那是由于，管線和管道的標高就是線或管的中間標高，往常再說管道多高時，就是把管道當作一根線。而假定做風管，那在標明標高時，辦法就有些不同。要說風管管底標高，仍是中間標高，仍是頂標高。所以在風管之前，要看清圖紙上的風管將來是上平齊，仍是下平齊，仍是中間齊，那相對應的調整管底標高，中間標高和頂標高。（此外，在做風管轉化時，也要針對性的要運用對應的一種）。

　　Before the transformation of air duct processing in Zhengzhou, there is a requirement to be clear, that is, the elevation of air duct. When checking with highly adjusted instructions, sometimes the results are different. That's because the elevation of pipelines and pipes is the middle elevation of pipelines or pipes. Usually, how high a pipeline is, the pipeline is regarded as a line. Assuming that the air duct is made, the method of marking the elevation is somewhat different. The bottom elevation of duct is still the middle elevation and the top elevation. Therefore, before the duct, it is necessary to see that the duct on the blueprint will be up-level, down-level, or in the middle, which corresponds to the adjustment of the bottom, middle and top elevation of the duct. (In addition, when making air duct conversion, we should also use the corresponding one.

　　那現在要做好風管轉化，這一步要輸入好以下方面：一是風管的材料，二是風管的壁厚，三是風管的接口型式，四是風管的保溫厚度。這些參數看一下闡明，假定沒有的話參看05N4-3的相關規定。

　　Now it is necessary to do a good job of air duct transformation, this step should input the following aspects: first, the material of the air duct, second, the wall thickness of the air duct, third, the interface type of the air duct, and fourth, the insulation thickness of the air duct. These parameters are illustrated by looking at the relevant provisions of 05N4-3, assuming they are not available.

　　二、風閥的制作及注意事項

　　2. Manufacture of air valve and matters needing attention

　　關于風閥能夠用轉化，也能夠直接制作，辦法能夠參看轉化設備。這兒說一劣勢閥中比較特別的內容。在管道里邊，閥門是不扣減管道長度的，但在風管里邊，風閥是要扣減掉風管的長度的，關于不同的風閥類型，有不同的扣減辦法。還有一種狀況，風管的寬度與風閥的長度有一個對應聯絡。咱們能夠依據具體的闡明來挑選不同的風閥類別。

　　About the air valve can be converted, but also can be directly manufactured, the method can refer to the conversion equipment. Here is a special part of the inferior valve. In the pipeline, the valve does not deduct the length of the pipeline, but in the duct, the valve is to deduct the length of the duct. There are different deduction methods for different types of valves. In another case, the width of the duct corresponds to the length of the valve. We can select different types of air valves according to specific specifications.