The Brondell O2+ Halo Standard Filter Replacement Pack includes one True HEPA filter and one woven carbon filter and works with all O2+ Halo Air Purifier models. The O2+ Halo will indicate when it is time to change the filters, which is recommended once a year.
Product Features:O2+ Halo replacement filter pack is great for removing allergens like dust, smoke, pollen, pet dander, odor, mold, VOCsTrue HEPAFilter set lasts 12 monthsFilter pack is compatible with all O2+ Halo air purification modelsIncludes 1 True HEPA and one woven carbon filter, owner's manualWarranty: 30 days(Model PHF-11)