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视频网站观看系统主要由集烟罩、91视频网站观看91视频成人网站、油烟净化器、91视频网站观看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视频网站观看91视频成人网站通风面积不够，气体流速过大。根据工程经验，91视频网站观看主91视频成人网站内风速不能超过15m/s。否则在运行一个时期以后，很容易造成91视频网站观看系统不通畅。在油烟净化器的运行实践中，大部分案例都是因91视频网站观看91视频成人网站通风面积不足引起的不通畅，91视频成人网站内气体的流速都在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视频网站观看91视频成人网站由于要穿过建筑梁而使91视频成人网站通风截面积变小，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视频网站观看91视频成人网站在穿过建筑梁或躲避其它设备91视频成人网站时，91视频网站观看91视频成人网站中的一段会低于整体91视频网站观看91视频成人网站平面。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视频网站观看91视频成人网站中，直接影响91视频网站观看通畅。

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视频成人网站排出，离出口近的楼层厨房91视频网站观看效果较好，而较低楼层的厨房91视频网站观看不通畅。

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视频网站观看设备的负压越大,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.