在安装算量中，有一个项目为暖通，其中通风系统是其中很重要的一环。以通风系统说一下操作的方法及注意事项。
In the installation calculation, there is a project for HVAC, in which ventilation system is a very important part. With the ventilation system to say the operation method and precautions.
首先通风系统在安装算量中有两种作法，一种是描图方式，一种是转化方式。这次针对性说一下转化方式的应用。
First of all, there are two methods in installation calculation of ventilation system, one is drawing mode, the other is conversion mode. This time, we will talk about the application of transformation mode.
本文主要强调通风系统中风管和风阀操作注意事项：
This paper mainly emphasizes the precautions for the operation of air duct and air valve in ventilation system
一、风管的识别
1、 Identification of air duct
对于风管的转化之前，有一个内容必须要先明确，那就是关于风管的标高。用高度调整命令查看时，有时显示出来的结果不一样。那是因为，管线和管道的标高就是线或管的标高，平时再说管道多高时，就是把管道看成一根线。而如果做风管，那在表示标高时，方法就有些不同。要说风管管底标高，还是标高，还是顶标高。所以在风管之前，要看清图纸上的风管将来是上平齐，还是下平齐，还是齐，那相对应的调整管底标高，标高和顶标高。（此外，在做风管转化时，也要针对性的要使用对应的一种）。


Before the conversion of duct, there is a content that must be clear first, that is, the elevation of duct. When viewing with the height adjustment command, sometimes the results displayed are different. That is because the elevation of the pipeline and the pipeline is the elevation of the center of the line or pipe. When we talk about the height of the pipeline, we regard the pipeline as a line. However, if the air duct is used, the method for representing the elevation is somewhat different. The bottom elevation, the center elevation and the top elevation of the duct should be mentioned. Therefore, before the air duct, it is necessary to see whether the air duct on the drawing will be flush at the top, at the bottom, or at the bottom, or on the center, and adjust the bottom elevation, center elevation and top elevation of the duct accordingly. (in addition, when doing duct conversion, we should also use the corresponding one).
那现在要做好风管转化，这一步要输入好以下方面：一是风管的材质，二是风管的壁厚，三是风管的接口型式，四是风管的保温厚度。这些参数更好看一下说明，如果没有的话参考05N4-3的相关规定。
Now to do a good job in the conversion of air duct, the following aspects should be input: first, the material of the air duct; second, the wall thickness of the air duct; third, the interface type of the air duct; fourth, the insulation thickness of the air duct. It is better to read the description of these parameters, if not, refer to the relevant provisions of 05n4-3.
二、风阀的绘制及注意事项
2、 Drawing of air valve and matters needing attention
关于风阀可以用转化，也可以直接绘制，方法可以参考转化设备。这里说一下风阀中比较特殊的内容。在管道里面，阀门是不扣减管道长度的，但在风管里面，风阀是要扣减掉风管的长度的，对于不同的风阀类型，有不同的扣减方法。如下图所示,有的是风管宽度不论什么值，风阀只扣一个固定值；有的是风管宽度论什么值，风阀长度扣固定加上风管的高度（或半径）；还有一种情况，风管的宽度与风阀的长度有一个对应关系。我们可以根据具体的说明来选择不同的风阀类别。
The air valve can be converted or drawn directly. The method can refer to the conversion equipment. Here is a special part of the air valve. In the pipeline specialty, the valve does not deduct the length of the pipe, but in the air pipe, the air valve should deduct the length of the air pipe. There are different deduction methods for different types of air valve. As shown in the figure below, in some cases, no matter what the width of the air duct is, the air valve is only fixed with a fixed value; in some cases, the length of the air valve is fixed plus the height (or radius) of the air duct; in another case, there is a corresponding relationship between the width of the air duct and the length of the air valve. We can select different types of air valves according to the specific instructions. 上一篇：济南酒店厨房排烟罩是种类是什么吗?
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