I set this up about 3 feet from where I and my THREE dogs sit most of the day (I'm disabled). After almost a week there wasn't any dust, dander or dog hair on the filter. Nothing. You couldn't even feel the air moving in or out of this thing if your hand was just a few inches away. Says on the box that it should be effective in up to a 6 square meter area. Completely useless so it was returned.