From a small point of view, the oil fume purifier can prevent some grease from entering the hood and flue, reduce the cleaning frequency, reduce the energy consumption of the machine, prolong the service life, and reduce the fire hazard caused by grease accumulation. In a big way, the cooking fume in the catering industry will really affect the atmospheric environment, and oil molecules will form PM11 or PM2.5, which will affect the public's health. From the previous point of view, it is really necessary to install an oil fume purifier.