introduction industrial fume purifiers are one of the essential devices in modern restaurants and kitchens that remove fume from the air, keeping the air fresh while reducing the risk of health problems. however, industrial oil fume purifiers often emit odors, affecting the hygiene and overall feeling of the kitchen, so deodorization has become a very important issue. why do industrial oil fume purifiers emit peculiar smell? most industrial oil fume purifiers remove odors through ion exchange. when the fume passes through the fume purifier, the ion exchange resin in the purifier will remove the air by adsorbing negative ions.