In the environmental protection system, the smoke exhaust pipe is divided into: suction and exhaust pipe, mining gas exhaust pipe, mining adhesive cloth air duct, etc. in the central air conditioning system of industrial and construction workers in factories and office buildings, the Jinan smoke exhaust pipe editor tells you that the exhaust pipe for dust removal, smoke exhaust and oil absorption for industrial pollution control, and the air supply pipe for industrial environment or post comfort. These smoke exhaust pipes are divided according to their purposes. Generally, the smoke exhaust pipes of smoke exhaust pipes are not used in the drainage pipes of buildings. Because rainwater is easy to corrode steel, PC pipes are generally used in the drainage pipes.

由兩個并列矩形煙管構成，垂直穿越各樓層。

It is composed of two parallel rectangular smoke pipes and vertically crosses each floor.

次煙道在住宅每層中設一連接排油煙機的進風口，次煙道與主煙道距進風口一定距離處相匯，主煙道底層有一補風口。其原理是通過抽油煙機將煙氣推入次煙道中，用抽油煙機推動力和油煙溫度上浮力使油煙上升一段距離后再進入主煙道排出屋面。這樣由于煙氣始終向上運動，避免了煙氣產生的倒灌和串味現(xiàn)象

The secondary flue is provided with an air inlet connecting the range hood in each floor of the residence. The secondary flue and the main flue converge at a certain distance from the air inlet, and there is a make-up air outlet at the bottom of the main flue. The principle is to push the flue gas into the secondary flue through the range hood, use the driving force of the range hood and the buoyancy of the oil fume temperature to make the oil fume rise for a certain distance, and then enter the main flue and discharge it from the roof. In this way, because the flue gas always moves upward, the backflow and cross smell of flue gas are avoided

排煙的意圖是將室內的煙塵通過抽風機械排到室外,而通風是能過機械使室內外的空氣進行強制流轉,他們的通風方向和地點就是不同的如果已經把副煙道拆除，或是需要防止倒煙的效果更好，那么使用煙道止逆閥。一般情況下，油煙機的止逆閥效果不是很明顯，而在煙道安裝止逆閥可以保護油煙機，使煙道里的煙不會向管道和抽油煙機內倒灌。不過，安裝止逆閥后要定期清洗，否則會使止逆閥呈打開狀態(tài)，失去效果，而且煙道止逆閥建議好兩年左右就更換一次。

The purpose of smoke exhaust is to exhaust the indoor smoke and dust to the outside through the exhaust machinery, and ventilation can force the air inside and outside the room through the machinery. First, their ventilation direction and location are different. If the auxiliary flue has been removed or the effect of preventing smoke pouring is better, then use the flue check valve. In general, the effect of the check valve of the range hood is not very obvious, and the installation of the check valve in the flue can protect the range hood so that the smoke in the flue will not pour back into the pipeline and range hood. However, the check valve shall be cleaned regularly after installation, otherwise the check valve will be open and lose its effect, and the flue check valve is recommended to be replaced once every two years.

通風管道材質的選擇對管道的施工質量也有很大影響。一般來說，為了保證管道的重量，需要較小板厚的管道，但需要綜合考慮管道的尺寸和壓力水平。從設計角度來看，值得注意的是，一個系統(tǒng)可以同時具有對應于不同靜態(tài)壓力水平的幾個管道厚度。風管的橫向連接有一定的應力。這種連接方法可以說是延長空氣導管長度的手段，并且還具有增強剛性和保持空氣導管橫向尺寸的功能通常，橫向連接方式是角鋼法蘭連接。這種連接模式取決于壁厚，也取決于連接類型和板墻加固模式。預制好的風管，需要做好存放工作，以免受到二次污染。可將管口用塑料布等密封材料封住，然后將風管分門別類堆放好。使用管道前，請注意清洗作業(yè)，確認板材表面沒有腐蝕，干燥后不進行清掃。。

The selection of ventilation pipe material also has a great impact on the construction quality of the pipe. Generally speaking, in order to ensure the weight of the pipeline, the pipeline with smaller plate thickness is required, but the size and pressure level of the pipeline need to be comprehensively considered. From a design point of view, it is worth noting that a system can have several pipe thicknesses corresponding to different static pressure levels at the same time. The transverse connection of air duct has certain stress. This connection method can be said to be a means to extend the length of the air duct, and also has the function of enhancing the rigidity and maintaining the transverse size of the air duct. Generally, the transverse connection method is angle steel flange connection. This connection mode depends on the wall thickness, the connection type and the plate wall reinforcement mode. The prefabricated air duct needs to be stored to avoid secondary pollution. The pipe orifice can be sealed with sealing materials such as plastic cloth, and then the air ducts can be stacked by categories. Before using the pipeline, please pay attention to the cleaning operation, confirm that the plate surface is free of corrosion, and do not clean it after drying..

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