The grease trap is not an oil fume purifier. Oil fume purifier is a kind of equipment used to purify cooking oil fume and odor. Usually, a series of filters and chemicals are used to remove oil fume and odor and discharge clean air. Oil separation tank is a common oil-water separation equipment in catering industry. Its main function is to separate the oil, fume and solid particles flowing into it by gravity, so that the water flowing out is cleaner and the pollution of oil, fume and the like is avoided. Their functions and principles are different and cannot be confused.