Using this unit for the past 2 weeks in a very dusty office. Ripping out and replacing the ancient carpet was not an option for me. So (after vacuuming and much cleaning of filth) I got one of these units. It has 3 speeds. Over nights and weekends I run it on "medium speed". During the day I run it at the relatively quiet "low speed" (and it make as much noise as a quiet desktop PC power fan which is not much). Air quality has improved dramatically. (Wish I had quantitative stats to back this up but I do not.) Unit is Energy Star certified.
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