（1） 單煙道式：

(1) Single flue type:

由一個簡單的矩形煙管構成，垂直穿越各層住宅，在每層住宅中留有一個連接抽油煙機的進風口，底層由一個補風口補氣。其原理是各層煙氣在抽油煙機的推動下，將油煙排入煙道中，由于煙氣溫度的作用，在煙道中產生上升浮力，從出屋面的出風口將煙氣排出。

Composed of a simple rectangular smoke pipe, it vertically passes through each floor of the residential building, leaving an air inlet connected to the range hood in each floor of the residential building, and the bottom floor is supplemented by a supplementary air outlet. The principle is that each layer of smoke is pushed by the range hood to discharge the smoke into the flue. Due to the temperature of the smoke, it generates upward buoyancy in the flue and is discharged from the roof outlet.

（2） 主次式：

(2) Primary and secondary equations:

由兩個并列矩形煙管構成，垂直穿越各樓層。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些距離處相匯，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象。

Consisting of two parallel rectangular smoke pipes, passing vertically through each floor. The secondary flue is equipped with an air inlet connected to the range hood on each floor of the residential building. The secondary flue meets the main flue at a distance from the air inlet, and there is a supplementary air outlet at the bottom layer of the main flue. The principle is to push the smoke into the secondary flue through a range hood, use the driving force of the range hood and the buoyancy force of the smoke temperature to raise the smoke for a certain distance, and then enter the main flue to exhaust the roof. In this way, due to the continuous upward movement of smoke, the phenomenon of backflow and cross odor caused by smoke is avoided.

（3） 變壓式：

(3) Variable voltage:

將各層的煙道做成不同的截面形式，下層煙道通過主次煙道排氣，而靠近屋面的煙道如同單煙道的作用，直接將油煙排入煙道排出。變壓式煙道的目的也是試圖通過改變煙道的截面形式，利用煙氣流動的各種物理規律，使氣流保持向上的運動，防止煙氣倒灌和互串。

Make the smoke ducts on each floor in different cross-sectional forms. The lower smoke ducts are discharged through the primary and secondary smoke ducts, while the smoke ducts near the roof act as a single smoke duct, directly discharging oil fumes into the smoke ducts. The purpose of variable pressure flue is also to attempt to change the cross-sectional form of the flue, utilize various physical laws of smoke flow, maintain upward airflow, and prevent smoke backflow and cross flow.

（4） 止逆閥式：

(4) Check valve type:

在單管煙道上的各層進風口處，加裝一個兼有抽油煙機接口作用的復雜防氣流逆行的止逆閥，迫使煙氣向煙道單向運動，從而解決煙氣互串的問題。

Install a complex anti backflow check valve at the air inlet of each layer on the single pipe flue, which also serves as an interface for the range hood, to force the flue gas to move unidirectionally towards the flue, thereby solving the problem of flue gas interlocking.

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