Vornado Replacement AQS500 Air Purifier filters (2-pack) Traps pollen, pet dander, bacteria, mold spores, dust mite debris and smoke particles Allergen reducing filters Average Filter Life: 6-12 Months Depending on Use For use with Vornado AQS 500 Air Cleane 6-12 months of life depending on use Built to meet U.S. voltage requirements. Certified, safety-tested, and warrantied for use only in the U.S.