What a great little machine this is. I purchased it for my 15 X 25 foot room in a very dust seniors residence. Just running for one day when it arrived alleviated all the sneezing and runny eyes. It is super quiet even at the highest setting sitting on my desk beside the computer. I leave it at the highest setting even when I go to bed and cannot hear it. You can also put fragrance oils in it. My room smells wonderful and I get a lot of positive comments on the smell. It was extremely easy to set up and the filter was super easy to install. I highly recommend this machine and had to contact the company with a question. They answered immediately and assured me they are there to help. With customer service like they offer I will look for their products again.