Negative Positive
Title: Works well but very noisy!
Review: This air purifier works very well to eliminate dust, polllen, etc. from the room. The auto detector kicks it into higher speeds when impurities are discovered -- very cool! It is extremely loud, however. It is essesntially a three-speed fan and its noise level is comparable to a medium-sized fan. We turn it off at night because it's in our master bedroom and keeps us awake a night. I'm pretty sure mose machines like this will create a similar noise level, so I still give it a high score.
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