Kitchen lampblack will harm the respiratory system of human body. The purpose of installing lampblack machine is to smoke lampblack during cooking and reduce indoor pollution. Therefore, when selecting models, we should first choose ones with high smoke exhaust efficiency.

厨房的91影视在线污污污系统主要由集烟罩、91影视在线污污污91在线视频观看、油烟净化器、91影视在线污污污和厨房整体补风装置构成。其主要原因有以下几种：

The smoke exhaust system of the kitchen is mainly composed of smoke collecting hood, smoke exhaust pipe, oil fume purifier, smoke exhaust and overall air supplement device of the kitchen. The main reasons are as follows:

1、主91影视在线污污污91在线视频观看通风面积不够，气体流速过大。根据工程经验，91影视在线污污污主91在线视频观看内风速不能超过15m/s。否则在运行一个时期以后，很容易造成91影视在线污污污系统不通畅。在油烟净化器的运行实践中，大部分案例都是因91影视在线污污污91在线视频观看通风面积不足引起的不通畅，91在线视频观看内气体的流速都在15m/s以上。

1. The ventilation area of the main smoke exhaust pipe is insufficient and the gas flow rate is too large. According to engineering experience, the wind speed in the main smoke exhaust pipe shall not exceed 15m / s. Otherwise, after a period of operation, it is easy to cause the smoke exhaust system to be blocked. In the operation practice of oil fume purifier, most cases are blocked due to insufficient ventilation area of smoke exhaust pipe, and the flow rate of gas in the pipe is more than 15m / s.

2、91影视在线污污污91在线视频观看由于要穿过建筑梁而使91在线视频观看通风截面积变小，截面上阻力增加，造成气流不通畅。

2. As the smoke exhaust pipe passes through the building beam, the ventilation cross-sectional area of the pipe becomes smaller and the resistance on the cross-section increases, resulting in unobstructed air flow.

3、91影视在线污污污91在线视频观看在穿过建筑梁或躲避其它设备91在线视频观看时，91影视在线污污污91在线视频观看中的一段会低于整体91影视在线污污污91在线视频观看平面。在使用一段时间后，由于油水混合物会积聚在较低的那段91影视在线污污污91在线视频观看中，直接影响91影视在线污污污通畅。

3. When the smoke exhaust pipe passes through the building beam or avoids other equipment pipes, one section of the smoke exhaust pipe will be lower than the plane of the overall smoke exhaust pipe. After using for a period of time, the oil-water mixture will accumulate in the lower section of the smoke exhaust pipe, which will directly affect the smoothness of smoke exhaust.

4、不同楼层的厨房油烟通过同一主91在线视频观看排出，离出口近的楼层厨房91影视在线污污污效果较好，而较低楼层的厨房91影视在线污污污不通畅。

4. The kitchen fume of different floors is discharged through the same main pipe. The kitchen smoke exhaust effect of the floor close to the exit is better, while the kitchen smoke exhaust of the lower floor is not unobstructed.

其次,要选择负压大的。因为饭店厨房91影视在线污污污设备的负压越大,吸烟能力越强.如您所述,目前市场上的油烟机分为平板式、半深型、深型和柜式等类型,它们因结构的不同产生的"负压区"也不同。

Secondly, we should choose the one with large negative pressure. As you mentioned, the range hoods on the market are divided into flat type, semi deep type, deep type and cabinet type, and their "negative pressure area" is also different due to different structures.