Holmes aer1 HAPF300AH True HEPA Allergen Remover Replacement Filter, 1pk: * Removes up to 99.97 percent of airborne allergens from air passing through the filter * Captures allergens and pollutants: pollen, dust, dust mite debris, mold, pet dander and smoke * Offers relief to allergy sufferers * Compatible with the following Holmes air purifiers: HAP9242, HAP9414, HAP9422