Negative Positive
Title: Very effective (but noise is an issue)
Review: I've been very impressed by our 04163 since our purchase several months ago. We have it on "auto" setting and it does speed up/slow down as it senses contaminants in the air (for example, when we fry bacon!). We feel that it has done well for us as an air filter (that's why we bought it). I'm fairly certain that I'll order another two of these units: one for our upstairs bedrooms and one for our basement.So... why not five stars? It is a little bit louder than we'd like and it does produce a very strong draft when it's running at maximum. Neither "shortcoming" is a surprise, of course, and those two drawbacks may well be the price of cleaning the air effectively.
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