Kitchen equipment smoke exhaust hoods are generally processed as a whole, including filtration, oil collection, water collection and other equipment, and are mostly produced by professional companies. Its appearance should be uniform, beautiful, and easy to clean. In kitchen ventilation, a certain amount of fresh air needs to be added. On the one hand, it can balance the air pressure and avoid excessive negative pressure in the kitchen (generally not exceeding 5Pa), and on the other hand, it can reduce the temperature inside the kitchen and improve the working environment. For the collection of cooking fumes, there are three main categories of gas collection (smoke) hoods used:

(1)簡易不含擋油板和送風設備的集氣罩適合各種靈活機動場所，便于加工安裝，便宜。但由于沒有送風設備，集風效果相對較差，容易使油煙在廚房工作人員面前回旋，并且容易造成油滴散落。

(1) The simple gas collection hood without oil baffles and air supply equipment is suitable for various flexible and mobile places, easy to process and install, and cheap in price. However, due to the lack of air supply equipment, the air collection effect is relatively poor, which can easily cause oil fumes to swirl in front of kitchen staff and cause oil droplets to scatter.

(2)含擋油板和送風設備的集氣罩能夠較好地收集烹飪過程產生的油煙，油滴不散落，只要送風風量合理，廚房操作人員工作面的空氣質量就好。但安裝要求較高，投資較大。

(2) The gas collection hood with oil baffle and air supply equipment can effectively collect oil fumes generated during the cooking process, and oil droplets do not scatter. As long as the air supply volume is reasonable, the air quality of the kitchen operator's working face is good. But the installation requirements are high and the investment is large.

(3)運水集氣(煙)罩

(3) Water and gas collection (smoke) hood

運水集氣(煙)罩的設計原理是形成水幕循環，與油煙碰撞后達到凈化油煙的目的。影響運水集氣(煙)罩使用效果的關鍵是要形成連續的水幕

The design principle of the water transportation and gas collection (smoke) hood is to form a water curtain circulation, which collides with the oil smoke to achieve the purpose of purifying the oil smoke. The key to affecting the effectiveness of water transportation and gas collection (smoke) hood is to form a continuous water curtain

而只是形成了斷續流動的水滴或小水柱，因此使用效果非常差。

However, it only forms intermittent flowing water droplets or small water columns, so the use effect is very poor.

使用運水集氣(煙)罩的優點是能夠在集氣(煙)罩處除掉部分油煙，減輕油煙凈化設備的處理負荷，提高系統的凈化效果。但如果運水集氣(煙)罩的過煙縫隙較窄，容易引起排煙系統不通暢。

The advantage of using a water carrying gas (smoke) hood is that it can remove some oil smoke at the gas (smoke) hood, reduce the processing load of the oil smoke purification equipment, and improve the purification effect of the system. But if the smoke passage gap of the water collection (smoke) hood is narrow, it is easy to cause the smoke exhaust system to be blocked.

集氣罩的設計對于排煙系統具有重要的影響。集氣罩設計不合理就很容易造成整個排煙系統不暢。引起排煙系統不通暢的因素有：

The design of the gas collection hood has an important impact on the smoke exhaust system. Unreasonable design of the gas collection hood can easily cause the entire smoke exhaust system to malfunction. The factors that cause obstruction of the smoke exhaust system include:

1)油板間或者運水集氣(煙)罩縫隙過小，這種情況較多

1) There are many cases where the gap between the oil plates or the water and gas collection (smoke) hood is too small

2)煙罩內收集油煙的開口總的截面積太小而引起整體排煙不通暢

2) The total cross-sectional area of the opening inside the hood for collecting oil fumes is too small, causing overall smoke exhaust to be obstructed

3)開口分布不合理或是開口沒有隨著與主管道的距離增大而增大，從而引起局部排煙不通暢

3) The distribution of openings is unreasonable or does not increase with the distance from the main pipeline, resulting in local smoke exhaust obstruction

4)集氣(煙)罩上面的集煙管道截面積太小，導致出煙不通暢。

4) The cross-sectional area of the smoke collection pipeline above the gas (smoke) hood is too small, resulting in obstructed smoke discharge.

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