During unpacking, we heard a suspicious rattling in the upper part of the case. Turning the purifier upside down, we saw through the ventilation ribs a screw that freely moved around the interior of the purifier. They got it somehow (photo of the screw below). I don’t know - maybe something was not screwed inside, or it’s an extra screw that rolled inside when it was assembled. Despite my curiosity, they did not open it out of harm's way. The cleaner itself works fine. Nothing seems to rattle. Therefore, I put 4 stars, but overall I am satisfied with the purchase.
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