EcoSilver PRE-FILTER: Silver nanoparticles in the EcoSilver pre-filter prevent the growth of microorganism on the filter, including bacteria and viruses COCONUT CARBON PRE-FILTER: The Coconut Carbon Pre-Filter not only captures larger particles but also excels in eliminating harmful VOC's, stubborn household odors, and pet odors, ensuring a comprehensive air purification experience with the HP450UV Air Purifier. H13 FILTRATION: H13 filter replacement captures up to 99.97 percent of particles as small as 0.3 microns including smoke, dust, pollen, pet hair and dander, mold spores, and dust mites. Improve the air quality in your home all year round. REPLACEMENT TIME: Depending on air quality environment and usage, it is recommended to replace the filter every 6 months and the pre-filter every 3 months to help ensure the Hunter air purifier is running efficiently. WHAT'S INCLUDED: Hunter Fan Company H13 true replacement filter package includes one (1) replacement filter and two (2) pre-filters. The Hunter Fan Company Replacement Filter Value Pack adds both filtration and value savings. The value pack conations both one (1) filter and also two (2) EcoSilver pre-filters. The silver nanoparticles in the Eco Silver pre-filter prevent the growth of microorganism on the filter, including bacteria and viruses. Coconut carbon in the pre-filter neutralizes odors, smoke, pollutants and allergens. To ensure effective filtration, it is recommended to replace the 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 HP450UV.