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廚房的排煙系統主要由集煙罩、排煙管道、油煙凈化器、排煙風機（含消音器）和廚房整體補風裝置構成，油煙凈化器的類型和運行方式可以根據實際情況進行選擇。在油煙凈化器安裝之前，首先要對排煙系統中各部分的實際運行參數，包括運行阻力和排風量進行核算。如果是新建項目，在設計時要充分考慮安裝了油煙凈化器后對排風系統的影響；如果是改造項目，在加裝油煙凈化器時需要對排風系統重新進行核算，必要時要對集煙罩、排煙管道和廚房整體補風裝置進行改造并更換排煙風機。

The smoke exhaust system in the kitchen mainly consists of a smoke hood, smoke exhaust pipes, an oil fume purifier, a smoke exhaust fan (including a silencer), and an overall kitchen air supplement device. The type and operation mode of the oil fume purifier can be selected according to the actual situation. Before installing the oil fume purifier, it is necessary to first calculate the actual operating parameters of each part of the smoke exhaust system, including operating resistance and exhaust air volume. If it is a new project, the design should fully consider the impact of installing an oil fume purifier on the exhaust system; If it is a renovation project, the exhaust system needs to be recalculated when installing an oil fume purifier. If necessary, the smoke hood, exhaust duct, and overall kitchen air supply device need to be modified and the exhaust fan replaced.

其次廚房油煙排風量的確定（排煙風機風量的計算）

Secondly, the determination of kitchen oil fume exhaust volume (calculation of exhaust fan air volume)

為了保證凈化效果，在實際設計時排煙風機的排煙風量要求嚴格按照排風罩的吸入風速計算，罩口的吸風速度通常不低于0.5m/s。Z小排風量通常用下式計算：L=1000PH式中：L—排風罩排風量，m3/h；P—罩口的周邊長（靠墻的邊不計），m；H—罩口至灶面的距離，m。著重講一下：排煙風機

In order to ensure the purification effect, the exhaust air volume of the smoke exhaust fan is strictly calculated according to the suction wind speed of the exhaust hood in actual design, and the suction speed of the hood opening is usually not less than 0.5m/s. The Z-small exhaust volume is commonly calculated using the following formula: L=1000PH, where L - exhaust volume of the exhaust hood, m3/h; P - The perimeter length of the hood (excluding the edge against the wall), m; H - distance from the hood to the stove surface, in meters. Let me emphasize: smoke exhaust fan

常用的排煙風機有排煙軸流風機、消防排煙箱式風機和消防排煙離心風機3種。

There are three types of commonly used smoke exhaust fans: axial smoke exhaust fans, fire smoke exhaust box fans, and fire smoke exhaust centrifugal fans.

（1）排煙軸流風機以前應用較多，但由于全壓小，在安裝油煙凈化器后很少應用。

(1) Smoke exhaust axial flow fans were widely used in the past, but due to their low total pressure, they were rarely used after installing oil fume purifiers.

（2）消防排煙箱式風機全壓中等，風量可以調節，且噪聲較低，常在集煙罩距油煙排放口距離中等的廚房排煙系統中選用

(2) The fire smoke exhaust box type fan has a moderate total pressure, adjustable air volume, and low noise. It is often used in kitchen smoke exhaust systems where the distance between the smoke hood and the oil fume discharge outlet is moderate

（3）消防排煙離心風機全壓和風量都可以調節，但由于噪聲較大，常需要做降噪處理。當廚房位于建筑物的底部時其排風機宜安放在屋頂，一方面可減少室內噪聲污染，同時排風風道處于負壓狀態，可避免氣味外溢。風機安放在屋頂時，一般選擇離心風機

(3) The total pressure and air volume of the fire exhaust centrifugal fan can be adjusted, but due to the high noise, noise reduction treatment is often required. When the kitchen is located at the bottom of a building, its exhaust fan should be placed on the roof to reduce indoor noise pollution. At the same time, the exhaust duct is in a negative pressure state to avoid odor leakage. When placing fans on the roof, centrifugal fans are generally chosen

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