This is such a quiet and unobtrusive machine. I have no idea if it does what it's supposed to. It gives me peace of mind so I used for Thanksgiving, 24/7, while I had house guests and dinner. I will use it again for Christmas dinner with family. I turn it on for 2-4 hours daily just because it gives me peace of mind. I think it does clean the air because there are no lingering cooking odors after each massive meal. Love the timer. No regrets about this investment.