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from
www.drugstore.com
it is also very quiet (my a/c is louder.) i've read some reviews on the web, and they have all been positive (i.e.
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from
www.amazon.com
air purifier is so effective without being loud like other air purifiers -- while it isn't quite "silent," on low the air purifier is whisper quiet, so i have no trouble falling asleep with it on.
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from
www.amazon.com
as far as its performance, it is a very quiet machine when operating at the low setting.
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from
N/A,
www.newegg.com
on the low fan setting it is very quiet, med is bearable and high is for when your not home.
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from
www.amazon.com
hi when we are out, medium when we are home, low for sleeping.
Positives:
Quiet Operation, Quiet Low Speed Operation, Strong Filtration, With HEPA Filter