濟南通風管道在現代建筑上的使用越來越科學，在施工過程中總體原則是小管讓大管：小管繞彎容易，且造價低，這種原則即是避讓原則。相信很多人對通風管道工程中的避讓原則不清楚。
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、小管讓大管：小管繞彎容易，且造價低。
1. Small pipe makes big pipe: small pipe is easy to bend, and the cost is low.
2、分支管讓主干管：分支管一般管徑較小，通風管道工程避讓理由見第1條，另外還有一點，分支管的影響范圍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、有壓管讓無壓管(壓力流管讓重力流管)：無壓管(或重力流管)改變坡度和流向，對流動影響較大。
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、常溫管讓高(低)溫管(冷水管讓熱水管、非保溫管讓保溫管)：通風管道工程高于常溫要考慮排氣;低于常溫要考慮防結露保溫。
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、給水管讓排水管：除了上述第3條原因外，通常排水管管徑大，且水中雜質多。
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、低壓管讓高壓管：高壓管造價高，且強度要求也高。
6. Low pressure pipe makes high pressure pipe: high pressure pipe has high cost and high strength requirements.
7、氣體管讓水管：水流動的動力消耗大。
7. Gas pipe to water pipe: the power consumption of water flow is large.
8、一般管道讓通風管：體積大，繞彎困難。
8. General pipe let ventilation pipe: large volume, difficult to detour.
9、金屬管讓非金屬管：金屬管易彎曲、切割和連接。
9. Metal tube makes non-metal tube: metal tube is easy to bend, cut and connect.
10、閥件小的讓閥件多的：山西油煙凈化系統考慮安裝、操作、維護等因素。
10. Small valves make more valves: Shanxi oil fume purification system considers installation, operation, maintenance and other factors.
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