Get rid of 90% of large allergens thanks to these filters from Filtrete! They capture dust, smoke, smog, mould spores, particles that carry viruses, and pet dander. In fact, they transform impure, polluted air from air passing through the filter into pure, fresh air to help you maintain overall good health. Furthermore, they meet the American Lung Association Health House Indoor Air Quality Guidelines. Each filter lasts up to 3 months and no unnecessary antimicrobial chemicals were added. Moreover, it's only made of material that completely inhibits the growth of bacteria, mould, mildew, and or fungi if used normally.