I decided to buy two air filters of this size, one on top and one on bottom, rather than buying a large block. We run one down all day and the other up all night. We saw a huge difference in nasal clarity in the morning! Our guests with allergies commented on the difference before we told them about the filter feature on the ground floor. Gets a little louder on higher settings. I vacuum the outside (white side) of each HEPA filter about once a week - see the difference in the attached photo - the filter on the right has not yet been cleaned. I am very satisfied with the device and have recommended it to others.
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