I'm not sure how to tell if this is actually purifying the air. I keep it on 24/7 in my large bedroom and it is still "whisper quiet", you can hear it but quieter than a fan or humidifier. There is some fuzz in the filter after a couple months of continuous use and I may have noticed less dust. We are moving it into the baby's room a few weeks before she is supposed to be born. Maybe in a smaller area we will be able to notice more of a difference.
Loud. Not Whisper quiet! HEPA part of filter gums up and becomes useless making the outer "vacuumable filter" worthless. Harmonics on this are awful on lowest setting
We are using the filter in our bedroom. It is quiet and removes a significant amount of allergens, such as dog dander, from the air. We have been extremely pleased with this filter.
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