First off - my husband and I smoke and have 2 dogs in the house. We put one in our kitchen, one in our great room and one in our master bedroom. We notices a difference in a couple of hours after we turned them on! We even bought 2 for my mother in-law and they have helped her asthma! They are not too loud that you can't sleep and after a while you don't notice the noise at all! Great Purifier!!!!! Buy Honeywell 18155 SilentComfort Permanent, True HEPA Air Purifier!
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