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With the development of society, China's construction industry has also been booming, and there are more and more modern high-rise buildings. These new buildings have the advantages of complex functions, large scale and concentrated personnel, which can bring people a good experience. However, such buildings also have huge hidden dangers, especially fire hazards. Once there is a fire, all kinds of indoor furniture and decoration materials will produce a lot of toxic gases, which will not only affect people's evacuation and escape, but also restrict the normal development of fire fighting operations. In order to improve the building, we need to improve the performance of the air duct according to the specific requirements of the building. The following is an in-depth analysis of this problem.

暖通、空調工程設計中，通風管道系統在穿越不同防火分區時，以及管道系統在平時工況和火災工況的功能實現，總是帶來很多復雜性，使得選擇合適的管道系統變的相對麻煩。

In the design of HVAC engineering, when the ventilation pipe system passes through different fire zones, and the function realization of the pipe system in normal and fire conditions, it always brings a lot of complexity, which makes it relatively difficult to choose the appropriate pipe system.

實際工程中，風管在某些部位總是需要具有一定的防火性能，在此我們可以通過很多方式來實現對風管的防火保護。

In the actual project, the air duct always needs to have a certain fire performance in some parts, here we can achieve the fire protection of the air duct in many ways.

防火測試方法

Fire test method

風管在沒有借助防火閥的情況下，其耐火性能的表達方式：防火穩定性、完整性和絕熱性。

Without the help of fire damper, the fire resistance performance of air duct can be expressed in the following ways: Fire stability, integrity and insulation.

穩定性的喪失發生于：風管的懸掛或固定件已無法使風管保持原有位置，截面發生垮塌。這一性能要求并不適用于內部受火風管在爐內的管段部分。

The loss of stability occurs when the suspension or fixing parts of the air duct can not keep the original position, and the section collapses. This performance requirement is not applicable to the section of internal fire air pipe in the furnace.

完整性的喪失表現為：風管上出現裂紋、洞口或撕裂或者與樓板（墻體）之間出現縫隙，致使火焰或熱氣穿透。固定或非固定風管在出現移動或變形現象時的完整性評估均包括在本準中。

The loss of integrity is manifested as: cracks, holes or tears appear on the air duct, or cracks appear between the air duct and the floor (wall), resulting in flame or hot gas penetration. The integrity assessment of fixed or unfixed ducts in case of movement or deformation is included in this standard.

絕熱性的喪失表現為：爐外風管段的外表面溫度上升平均值超過140°或者單點的溫度上升超過180°。這一標準同時也指出風管披覆有易燃材料或者內部積存有油脂等，也應當滿足風管的防火要求。

The loss of thermal insulation is shown as follows: the average temperature rise of the outer surface of the air duct section outside the furnace is more than 140 ° or the temperature rise of a single point is more than 180 ℃. This standard also points out that if the air duct is covered with flammable materials or has grease accumulated inside, it should also meet the fire protection requirements of the air duct.