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We often have dense pipes on the construction site of ventilation pipes. We don't know the purpose of each pipe and what problems need to be paid attention to in the construction of ventilation pipes. Today, I'm going to talk about the installation of smoke exhaust and ventilation pipes with Xiaobian.

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思考排氣;低于常溫要思考防結露保溫。分支管讓主干管：分支管通常管徑較小，通風管道工程躲避，別的還有一點，分支管的影響規模和重要性不如主干管。

The normal temperature pipe allows the high (low) temperature pipe (the cold water pipe allows the hot water pipe, and the non insulated pipe allows the insulated pipe): when the ventilation pipeline engineering is higher than the normal temperature, the exhaust should be considered; Below normal temperature, anti condensation and thermal insulation shall be considered. The branch pipe gives way to the main pipe: the branch pipe usually has a small diameter, which is avoided by the ventilation pipe project. In addition, the influence scale and importance of the branch pipe are not as important as the main pipe.

有壓管讓無壓管(壓力流管讓重力流管)：無壓管(或重力流管)改動斜度和流向，對活動影響較大。小管讓大管：小管繞彎簡單，且造價低。給水管讓排水管：除了上述第3條要素外，通常排水管管徑大，且水中雜質多。

Pressure pipe to non pressure pipe (pressure flow pipe to gravity flow pipe): the non pressure pipe (or gravity flow pipe) changes the slope and flow direction, which has a great impact on the activity. Small tube to big tube: small tube bending is simple and low cost. Water supply pipe and drainage pipe: in addition to the above element 3, the diameter of the drainage pipe is usually large and there are many impurities in the water.

通常管道讓通風管：體積大，繞彎困難。氣體管讓水管：水活動的動力耗費大。低壓管讓高壓管：高壓管造價高，且強度請求也高。給水管讓排水管：除了上述第3條要素外，通常排水管管徑大，且水中雜質多。金屬管讓非金屬管：金屬管易彎曲、切割和銜接。

Usually, the ventilation pipe is large and difficult to bend. Gas pipe makes water pipe: the power consumption of water activity is large. Low pressure pipe to high pressure pipe: high pressure pipe has high cost and high strength requirements. Water supply pipe and drainage pipe: in addition to the above element 3, the diameter of the drainage pipe is usually large and there are many impurities in the water. Metal pipe makes non-metallic pipe: metal pipe is easy to bend, cut and connect.

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