I'm surprised almost no reviews mention the uncomfortable noise level this air purifier makes. Yes it seems to be able to clean the air but in my opinion even at the lowest speed it was too much to walk around the bedroom at night, I couldn't sleep well. And at each higher speed it gets a lot louder and spins like a decent vacuum at top speed. I don't understand how I could be in the same room with him for a long time without getting annoyed or tired of that noise - and that's why he's coming back now. I don't know if it was really defective or not even different from other devices as I can't compare it to the same model - but I bought a completely different air purifier from another store and it actually runs quietly on the lowest setting and not too loud at higher settings while cleaning the air well.
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