A picture is worth a thousand words. I run the oven fan 24 hours a day/7 days a week. Always keep the air moving and clean it that way. I have a recording studio and I want the air to be as clean and free of flying particles as possible. I've been using these filters for years and they haven't disappointed me. Photos show results 24 hours/7 days a week for 3 months. It's SoCAL's dirty air. I would also like to add that I was very close to the burn zone of the last fires we just had and although soot and ash were flying outside I didn't smell anything inside.
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