In most cases, oil fume should be discharged into the high air, with a few exceptions. Some commercial residential buildings, commercial office buildings, shopping malls, underground shopping malls, etc. are too high, and there are dozens of floors and hundreds of floors. If the cost is too high to be discharged to the bottom of the building, it is unrealistic for merchants, and some merchants are above-ground shopping malls, which cannot be discharged to the high altitude. In this case, if the restaurant is equipped with an oil fume purifier and the purification efficiency reaches the standard, it can be discharged to the low altitude, but the pipeline outlet cannot be opposite to the pedestrian flow and residential areas.

when the merchants with shorter floors are able to discharge into the air, they should install pipelines to discharge the oil fume into the air. In some third-and fourth-tier cities, the requirements for environmental inspection are not so strict. Installing some lampblack purifiers with low purification efficiency can be used as a lampblack machine in Shenzhen. In this case, pipes must be installed to discharge lampblack into the high air.

In many places, due to the relatively underdeveloped economy, the environmental protection departments also hold the mentality that it is better to do more than one thing, and the law enforcement is not strict. In order to save costs, catering merchants directly discharge oil fume to low altitude without installing pipelines and purification facilities. At this time, if low-altitude emission affects the normal life of residents, they should actively complain to the relevant departments. After receiving complaints, the relevant departments will generally actively deal with them. If the relevant departments do not act actively, they can report to the local letters and calls bureau or call the public hotline.

for catering merchants, the most effective way is to follow the low-altitude oil fume purifier. Among the low-altitude oil fume purifiers, the better brands are Tianlong Oil Fume Purifier and Jinglan Oil Fume Purifier. Many catering merchants who used to have heavy oil fume can completely purify the oil fume after following the purifier, improving the air quality nearby and also gaining the reputation of the restaurant.