These are the cheapest filters and actually help remove odors from the air. They get more expensive every time I need them and I change them every month. This is required for 2 dogs, 1 cat and a smoker in the house. Be sure to buy them. They are better made than the ones you can buy on the street. The picture shows a comparison to one I bought that costs more and doesn't reduce carbon or odor. They should both be merv 8 (recommended by HVAC when a new system was installed 3 years ago, don't need more unless health issues and a well known brand) but I find conflicting merv 5 or 8 ratings for 3M filters. A very well designed filter at a reasonable price. Only they are better processed and have become so expensive that I can no longer afford them.
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