Replacement filter compatible with Therapure TPP220F filter. Engineered to fit Therapure Envion tower air purifier models TPP220, TPP-220M, TPP 220H. True HEPA filtration captures up to 99.97 percent of particles as small as 0.3 microns from the air including smoke, dust, pollen, mold spores, pet hair and dander, and dust mites. Recommended to replace filter every six (6) months for maximum efficiency, or more often in harsh environments. Contains one (1) replacement filter.