Negative Positive
Title: Surprising benefit - quieter!
Review: Ordinarily I would not be particularly excited about odor-removing filters. However, I was surprised after installing my first replacement set of odor filters that my purifier (model 04163) ran much quieter at the lowest speed setting. I'm not entirely sure of the added electrical cost of running these filters (I have pet birds that generate a lot of dust and dander and the filters run 24/7), but it may be that the reduced fan speed to get the same air discharge will save me money. Nice!
Is the review positive or negative? 