The compatible with Sharp FZA80DFU includes two replacement Active Carbon pre-filters designed for Sharps FPA60UW and FPA80UW Air Purifiers. Each active carbon pre-filter removes odors, captures large particles and is effective up to 6 months under normal use. Replacement Active Carbon filter designed for a compatible with Sharp True HEPA Air Purifier with Plasmacluster Ion Technology for medium or extra large rooms (FPA80UW) (FPA60UW) Carbon-based filter designed to remove common household odors including smoke, cooking odors, and pet odors and VOCs Filter captures larger particles from the air, including pet hair and dander, extending the life of the True HEPA filter Filters are properly sealed to protect lifetime usage Recommended replacement every 6 months