3M's top-of-the-line filter captures 99.97 percent of airborne particles from the air passing through the filter media, including dust, allergens, bacteria and viruses. Designed with electrostatic air filtration, the Filtrete Premium Allergen, Bacteria and Virus True HEPA Filter (F1) traps particles 1000 times smaller than the human eye can see. It helps maintain sufficient airflow - good for your home and your air purifier. Particles captured include dust, lint, dust mite debris, mold spores, pollen, pet dander, smoke, smog, bacteria, viruses, PM 2.5, exhaust particles and ultra-fine particles. Use this air filter in Filtrete Smart Air Purifier for medium rooms.