This is a great 3M product. We run the air cleaner 24/7 in our front smoking room. It keeps the air fresh and the rest of the apartment from smoke. We get 3 months on each filter, as the instructions say the filter gets better as it gets dirtier. The filters are a bit expensive but they deliver as promised and then some. Highly recommended. We have been using the air cleaner and filters for about 4 years.Save 43% Off
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