The Hunter Fan Company Replacement Filter Value Pack adds both filtration and value savings. The value pack conations both one (1) True HEPA filter and also two (2) pre-filters. Coconut carbon in the pre-filter neutralizes odors, smoke, pollutants and allergens. True HEPA filtration removes up to 99. 9% of airborne particles as small as 0. 3 microns in size including smoke, dust, pollen, pet hair and dander, mold spores and dust mites. This helps to ensure improved indoor air quality. To ensure effective filtration, it is recommended to replace the HEPA filter every 6 months and pre-filter every 3 months for maximum efficiency, or more often depending on air quality & environmental factors. Fits Hunter air purifier models HPH625 2 in 1 Air Purifier & Humidifier Combo.