厨房的排烟系统主要由集烟罩、排烟管道、油烟净化器、排烟风机（含消音器）和厨房整体补风装置构成，油烟净化器的类型和运行方式可以根据实际情况进行选择。在油烟净化器安装之前，首先要对排烟系统中各部分的实际运行参数，包括运行阻力和排风量进行核算。如果是新建项目，在设计时要充分考虑安装了油烟净化器后对排风系统的影响；如果是改造项目，在加装油烟净化器时需要对排风系统重新进行核算，必要时要对集烟罩、排烟管道和厨房整体补风装置进行改造并更换排烟风机。

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.

其次厨房油烟排风量的确定（排烟风机风量的计算）

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

为了保证净化效果，在实际设计时排烟风机的排烟风量要求严格按照排风罩的吸入风速计算，罩口的吸风速度通常不低于0.5m/s。Z小排风量通常用下式计算：L=1000PH式中：L—排风罩排风量，m3/h；P—罩口的周边长（靠墙的边不计），m；H—罩口至灶面的距离，m。着重讲一下：排烟风机

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

常用的排烟风机有排烟轴流风机、消防排烟箱式风机和消防排烟离心风机3种。

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）排烟轴流风机以前应用较多，但由于全压小，在安装油烟净化器后很少应用。

(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）消防排烟箱式风机全压中等，风量可以调节，且噪声较低，常在集烟罩距油烟排放口距离中等的厨房排烟系统中选用

(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）消防排烟离心风机全压和风量都可以调节，但由于噪声较大，常需要做降噪处理。当厨房位于建筑物的底部时其排风机宜安放在屋顶，一方面可减少室内噪声污染，同时排风风道处于负压状态，可避免气味外溢。风机安放在屋顶时，一般选择离心风机

(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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