Package Includes: 2 * Sales BS03 HEPA 3-in-1 Air Purifier Filters.Compatible with Part U and Part X BS-03 HEPA Air Purifier. Maintain a powerful suction and prolong the lasting of the air purifiers. H13 Grade True HEPA Filter: HEPA Filter charged to capture and hold onto extremely 99.97% of dirt, pet dander and so on, which are helpful for keeping your house truly tidy and improving the air quality at home.Ideal product for anyone who seek for a fresh and clean environment. Easy to Install: Easy to install without tools. Change the filter regularly to prolong the performance of the humidifier. Using high efficiency air cleaner filters and replacing the filters regularly will help optimize air cleaning performance.