The Filtrete air filter captures 90% of large allergens like mould spores and pet dander from the air passing through the filter. It even gets rid of microscopic allergens like dust, smoke, smog, bacteria, and particles that may carry viruses. Each filter lasts up to 3 months. They meet the American Lung Association Health House Indoor Air Quality Guidelines. Plus, no unnecessary antimicrobial chemicals were added. Its filtering material inhibits the growth of bacteria, fungi, mould, and mildew in normal use. Dimensions: 1 in. x 16 in. x 20 in.