1、 Length of kitchen smoke exhaust pipe

廚房排煙管道水平段不宜過長一般遠水平距離不應超過15m，坡度少應為2%。水平端有柔性接頭，便于清理油脂。根據規范，排氣速度少為10m/s，并且需要在與排氣罩相連的支管中提供空氣，以防止油因風速過低而粘附在煙囪上。

The horizontal section of kitchen smoke exhaust pipe should not be too long. Generally, the distance to the far horizontal should not exceed 15m, and the slope should be at least 2%. The horizontal end has a flexible joint to facilitate grease cleaning. According to the specification, the exhaust speed shall be at least 10m / s, and air shall be provided in the branch pipe connected to the exhaust hood to prevent oil from adhering to the chimney due to low wind speed.

二、廚房排煙管道設計安裝的合理性

2、 Rationality of design and installation of kitchen smoke exhaust pipe

工程經驗表明，主排煙道風速不能超過15m/s。否則，經過一段時間的運行(如一年后)，排煙系統很容易變鈍。油煙凈化器在運行中，多數情況下是因為排氣管通風面積不夠，管內氣體流速在15m/s以上。

Engineering experience shows that the wind speed of the main exhaust flue shall not exceed 15m / s. Otherwise, after a period of operation (such as one year), the smoke exhaust system is easy to become dull. During the operation of the oil fume purifier, in most cases, the ventilation area of the exhaust pipe is not enough, and the gas flow rate in the pipe is more than 15m / s.

三、排煙管不暢通的原因

3、 Reasons for blocked smoke exhaust pipe

1、由于排煙管要穿過建筑梁，管道的通風截面積變小，截面阻力變大，從而阻礙氣流。

1. As the smoke exhaust pipe passes through the building beam, the ventilation cross-sectional area of the pipe becomes smaller and the cross-sectional resistance becomes larger, thus hindering the air flow.

2、排煙管穿過建筑物橫梁或避開其他設備管道時，排煙管的橫截面低于整個排煙管的平面。使用一段時間后，油水混合物會在排氣管下部積聚，直接影響排氣的順暢性。

2. When the smoke exhaust pipe passes through the building beam or avoids other equipment pipes, the cross section of the smoke exhaust pipe is lower than the plane of the whole smoke exhaust pipe. After using for a period of time, the oil-water mixture will accumulate at the lower part of the exhaust pipe, which will directly affect the smoothness of exhaust.

3、不同樓層廚房油煙通過同一總管排出，靠近出風口的樓層廚房排煙效果更好，而較低樓層廚房則不順暢。

3. The oil fume of kitchens on different floors is discharged through the same main pipe. The smoke exhaust effect of kitchens on floors close to the air outlet is better, while the kitchens on lower floors are not smooth.