济南通风管道在现代建筑上的使用越来越科学，在施工过程中总体原则是小管让大管：小管绕弯容易，且造价低，这种原则即是避让原则。相信很多人对通风管道工程中的避让原则不清楚。
The use of ventilation pipes in modern buildings is becoming more and more scientific. In the process of construction, the general principle is that small pipes make big ones; small pipes are easy to bend, and the cost is low. This principle is the principle of avoidance. It is believed that many people are not clear about the principle of avoidance in ventilation pipeline engineering.
1、小管让大管：小管绕弯容易，且造价低。
1. Small pipe makes big pipe: small pipe is easy to bend, and the cost is low.
2、分支管让主干管：分支管一般管径较小，通风管道工程避让理由见第1条，另外还有一点，分支管的影响范围和重要性不如主干管。
2. Branch pipe to main pipe: the diameter of branch pipe is generally small. See article 1 for the reason of avoiding branch pipe works. In addition, the influence scope and importance of branch pipe are not as important as that of main pipe.
3、有压管让无压管(压力流管让重力流管)：无压管(或重力流管)改变坡度和流向，对流动影响较大。
3. The pressure pipe lets the non pressure pipe (pressure flow pipe lets gravity flow pipe): the non pressure pipe (or gravity flow pipe) changes the slope and flow direction, which has a great impact on the flow.
4、常温管让高(低)温管(冷水管让热水管、非保温管让保温管)：通风管道工程高于常温要考虑排气;低于常温要考虑防结露保温。
4. High (low) temperature pipe (cold water pipe, hot water pipe and non thermal insulation pipe): vent shall be considered when the ventilation pipe works are higher than the normal temperature; anti condensation insulation shall be considered when it is lower than the normal temperature.
5、给水管让排水管：除了上述第3条原因外，通常排水管管径大，且水中杂质多。
5. Water supply pipe let drainage pipe: in addition to the above reasons in Article 3, the diameter of drainage pipe is usually large and there are many impurities in the water.
6、低压管让高压管：高压管造价高，且强度要求也高。
6. Low pressure pipe makes high pressure pipe: high pressure pipe has high cost and high strength requirements.
7、气体管让水管：水流动的动力消耗大。
7. Gas pipe to water pipe: the power consumption of water flow is large.
8、一般管道让通风管：体积大，绕弯困难。
8. General pipe let ventilation pipe: large volume, difficult to detour.
9、金属管让非金属管：金属管易弯曲、切割和连接。
9. Metal tube makes non-metal tube: metal tube is easy to bend, cut and connect.
10、阀件小的让阀件多的：山西油烟净化系统考虑安装、操作、维护等因素。
10. Small valves make more valves: Shanxi oil fume purification system considers installation, operation, maintenance and other factors. 上一篇：酒店安装通风管道的重要性
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