Compatibility: Compatible with Hunter H-HF400-VP filter and Hunter HP400 air purifier. 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 HP400 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. Air Quality Improvement: Filtration is rated H13 and removes up to 99.97% of airborne particles as small as 0.3 microns in size including dust, smoke, pollen, pet hair and dander, and more. Replacement Quantity: Each package contains one (1) replacement H13 filter and two (2) replacement carbon pre-filters. Filter-Monster branded replacement pack for Hunter HP400 Cylindrical Tower Air Purifier. Filter removes smoke, dust, pollen, pet dander, mold spores, and dust mite debris from the air. Package contains one (1) H13 filter and two (2) carbon pre-filters.