It really is one of the quietest units / on the down side the unit seems to alert for a change of filter based on time of use and not on resistance of the filter (DOP).
We have to change this filter out every two - two and a half weeks as our well water is not good for us to drink. We use this water in our Kerig Coffee Machine....
I've tried several different brands of air filters and have found the Winix to be top-notch. Sturdy, dependable, and as long as you change out the filters as they recommend, it does an excellent job at filtering odors and particulates. I have several in my offices and in my home.
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