4 stoves kitchen, that belongs to the medium-sized catering units, and the current state of the most stringent catering fume emission standards is that the medium-sized catering units fume purification rate should reach more than 90%, particulate matter purification rate of more than 85%, non-methane total hydrocarbon purification rate of more than 75%.
To get to this effect, it is more reliable to use high standard oil smoke purifier.
The subject can consider the use of GOJEK's high-efficiency electrostatic fume purifier, if you use more chili peppers, you can add a UV light deodorizer, so that you can pass the environmental assessment.