(1) Thermal insulation. Catering buildings belong to commercial operation, with a large amount of lampblack. The direction of kitchen smoke exhaust pipe often spans multiple rooms. If thermal insulation is not applied, the heat of the pipe will affect the temperature of the room crossing.

（2）防火作用。廚房排氣管通常由鍍鋅鐵或不銹鋼制成。長期使用后，油垢污垢會積聚在管道內壁上。如果不小心使用，會導致火災。

(2) Fire protection. Kitchen exhaust pipes are usually made of galvanized iron or stainless steel. After long-term use, oil dirt and dirt will accumulate on the inner wall of the pipe. If not used carefully, it may cause fire.

對廚房排煙管進行封裝，一是起到其保溫隔熱的作用，二是起到防火的作用。在餐飲建筑廚房排煙工程施工中，不能忘記廚房排煙管的封裝。

Encapsulation of kitchen smoke exhaust pipe plays the role of heat insulation and fire prevention. In the construction of kitchen smoke exhaust engineering in catering buildings, the sealing of kitchen smoke exhaust pipe should not be forgotten.

抽油煙機和煙道的接口，密封一定一定要做好，排煙管道和煙道是需要人工連接的，要是不小心漏條縫什么的就會漏煙，而且不容易察覺。另外，煙道止回閥是個好東西，可以防止公共煙道里的煙進入自家廚房，希望大家大多能擁有。

The sealing of the interface between the range hood and the flue must be done well. The smoke exhaust pipe and the flue need to be manually connected. If the seam is accidentally leaked, the smoke will leak, and it is not easy to detect. In addition, the flue check valve is a good thing, which can prevent the smoke in the public flue from entering your kitchen. I hope everyone can have it.

在日常的使用過程中。

In daily use.

油煙機表面和煙管內部的積存油污很快，長期得不到處理，油垢也會越積越厚，如果遇明火或溫度過高會燃燒，并沿著管道內壁蔓延。另外，油垢堵塞通道后，會造成煙囪和油煙管道內溫度過高，引起油垢自燃或管道可燃外包裝材料燃燒造成火災。

The oil stain on the surface of the range hood and inside the smoke pipe accumulates quickly and cannot be treated for a long time. The oil stain will also become thicker and thicker. In case of open fire or high temperature, it will burn and spread along the inner wall of the pipe. In addition, after the oil dirt blocks the passage, the temperature in the chimney and the oil smoke pipe will be too high, which will cause the oil dirt to self ignite or the pipe to burn the combustible outer packaging materials, causing a fire.

抽油煙機和煙道的接口，密封一定一定要做好，排煙管道和煙道是需要人工連接的，要是不小心漏條縫什么的就會漏煙，而且不容易察覺。另外，煙道止回閥是個好東西，可以防止公共煙道里的煙進入自家廚房，希望大家大多能擁有。

The sealing of the interface between the range hood and the flue must be done well. The smoke exhaust pipe and the flue need to be manually connected. If the seam is accidentally leaked, the smoke will leak, and it is not easy to detect. In addition, the flue check valve is a good thing, which can prevent the smoke in the public flue from entering your kitchen. I hope everyone can have it.