The filter replacement is compatible with RENPHO air purifier model RP-AP088B RP-AP088W Our filter replacement is designed with 5-in-1 True HEPA 360° Filtration High-Efficiency System, Equip with Polypropylene Pre-Filter, Special Silver lons Filter,H13 True HEPA Filter and Activated Carbon Filter.the filter targets all common air pollutants such as pollen, pet dander, VOC's, smoke, and odors High efficiency granular carbon absorbs unpleasant odors from cooking, pets, and smokingin your home, better than the other carbon pre-filters It is recommended to replace the filter filter every 6-12 months depending on using environment