In installation calculation, there is a special system for HVAC, and ventilation system is an important part of HVAC. Let me talk about the operation method and precautions of the ventilation system.

　　，通风系统在安装计算中有两种方法，一种是绘图法，另一种是转换法。 这次，谈谈转换方法的应用。

　　Firstly, there are two methods in installation calculation of ventilation system, one is drawing method, the other is conversion method. This time, talk about the application of conversion methods.

　　通风考虑因素主要包括风口，风道，风门，风力设备和一些配件。

　　The major considerations of ventilation include air outlets, air ducts, air doors, wind power equipment and some accessories.

　　这次主要强调通风系统中风管和风门的操作注意事项：

　　Emphasis is placed on the operation of air ducts and air doors in the ventilation system.

　　一，风管的识别

　　1. Identification of air ducts

　　在转换管道之前，必须有明确的内容，即管道的高度。 使用高度调整命令查看时，有时显示的结果会有所不同。 那是因为管道和管道的标高是管道或管道的中心标高。 当管道很高时，它就是管道。 如果使用风管，则指示高程时方法会有所不同。 据说管道的底部是高程，或者是中心高程，或者是高海拔。 因此，在导风管之前，有必要查看图纸上的导风管是否平齐或中心齐平，并相应调整管的底部高度，中心高度和顶部高度。  （此外，在进行风管转换时，还必须使用相应的风管）。

　　Before switching the pipeline, there must be a clear content, that is, the height of the pipeline. When viewed with the height adjustment command, sometimes the results will be different. That's because the elevation of pipes and pipes is the central elevation of pipes or pipes. When the pipe is very high, it is the pipe. If air duct is used, the method of indicating elevation will be different. It is said that the bottom of the pipeline is the elevation, or the central elevation, or the highest elevation. Therefore, before the duct, it is necessary to check whether the duct on the drawing is even or the center is even, and adjust the bottom height, the center height and the top height of the duct accordingly. (In addition, the corresponding duct must be used when the duct conversion is carried out).

　　现在有必要做好风管转换。 此步骤应输入以下方面：一个是管道的材料，另一个是管道的壁厚，第三个是管道的界面类型，第四个是管道的绝缘厚度。 好查看这些参数的说明，否则请参见05N4-3的相关规定。

　　Now it is necessary to do a good job of air duct conversion. This step should input the following aspects: one is the material of the pipe, the other is the wall thickness of the pipe, the third is the interface type of the pipe, and the fourth is the insulation thickness of the pipe. It is better to see the description of these parameters, otherwise please refer to the relevant provisions of 05N4-3.

　　二，风阀的起草及注意事项

　　2. Drafting of air valves and matters needing attention

　　关于阻尼器，它可以转换或直接绘制。 该方法可以参考转换设备。 这里谈谈风门的特殊内容。 在管道行业中，阀门并没有扣除管道的长度，但是在管道中，阻尼器就是要减少管道的长度。 对于不同类型的阻尼器，有不同的推导方法。 如下图所示，某些风管宽度无论是什么值，风门仅屈曲一个固定值； 一些是风道宽度，风门的长度是固定的，风道的高度（或半径）的值； 管道的宽度与风门的长度相对应。 我们可以根据具体说明选择不同的风门类别。

　　With respect to dampers, they can be converted or drawn directly. This method can refer to the conversion equipment. Here we talk about the special content of the damper. In the pipeline industry, the valve does not deduct the length of the pipeline, but in the pipeline, the damper is to reduce the length of the pipeline. There are different deduction methods for different types of dampers. As shown in the figure below, some duct widths, no matter what, buckle only a fixed value; some are duct widths, the length of the duct is fixed, the height (or radius) of the duct; the width of the duct corresponds to the length of the duct. We can choose different types of throttle according to the specific instructions.