Meets the American Lung Association Health House Indoor Air Quality guidelines.These MERV 12 furnace filters captures airborne contaminates as small as bacteria and particulates that carry viruses. Simply the best we offer when it comes to indoor air quality. FG-Pleats MERV 12 are perfect for other contaminants such as smoke, pet dander, mold spores, carpet lint, dust mite feces and pollen, tree pollen, and grass pollen. These filters will provide a great health benefit to everyone that lives or works in your home or office. Contaminants are year round and just because you can’t see them, doesn’t mean that they are not prevalent in your environment. Recommended changing interval is 90 days, however, Filters Galore recommends that you change your filters no later than 2 months if you run your furnace fan continuously. Running your furnace fan continuously will provide constant movement of air in your home or office, which is being filtered by your high efficiency filters. Filters Galore is "Simply Changing Indoor Air Quality in American Homes One by One". You'll breathe and feel the difference, we guarantee it!