Catering range hood is an essential equipment in restaurants, hotels and other places. Its function is to exhaust harmful gases such as oil fume, heat and odor generated in the kitchen, so as to ensure the cleanliness, hygiene and comfort of the kitchen air. The exhaust air volume is an important index to measure the quality of the range hood. Generally, it is required that the exhaust air volume is greater than a certain value, and the reasons for the large exhaust air volume are as follows:

1. The environment of the restaurant kitchen is complex. There are many cookers and large firepower in the kitchen, and the operator moves quickly, which will make the fume and heat in the air be discharged quickly. If the exhaust air volume is not large, it will be difficult to effectively remove the pollutants in the kitchen, which will affect the comfort and hygiene level of the operating environment.

2. There are various cooking methods. The types of cooking utensils and cooking methods in the kitchen are very different, such as different operation requirements such as frying, frying, roasting, boiling and stewing, and the forms of exhaust ports are also different. We must consider these factors to design the exhaust volume of the range hood to ensure that it can effectively absorb and discharge different fumes and pollutants.

3. pressure loss. As the discharge speed of the fan becomes higher and higher, the air flow speed will also increase accordingly. In this case, if the exhaust air volume of the range hood is not large enough, it may cause pressure loss, which will lead to the failure to discharge the lampblack smoothly, thus affecting the cleaning effect of the range hood, and it is also easy to cause environmental pollution and fire hazards.

4. Requirements of operators. In order to ensure the comfort and safety of operators in the kitchen, it is often necessary to design the air outlet at a higher position to discharge the oil smoke and hot air to the maximum extent. In this way, the exhaust air volume must be increased in order to improve the exhaust efficiency and reduce the work intensity of the operator.

to sum up, the large exhaust air volume of the catering range hood is to ensure the environmental safety and hygiene of the kitchen, and at the same time, it can increase the author's work comfort and efficiency. Therefore, when purchasing and designing the range hood, these factors must be fully considered to determine the appropriate exhaust air volume standard.