The Brondell O2+ Air Purifier replacement filter pack includes one True HEPA filter and one granular activated carbon filter and fits both the Source (P300) and Balance (P400) O2+ Air Purifier models. Both the Source and Balance will indicate when it is time to change the filters, which is recommended once a year.
Product Features:Filter pack is compatible with all Source and Balance O2+ air purifier modelsAHAM VerifideO2+ replacement filter pack is great for removing allergens like dust, smoke, pollen, pet dander, odor, mold, VOCsEasy-to-replace filter pack lasts 1 yearIncludes 1 True HEPA filter and 1 granular activated carbon filterWarranty: 30 days(Model PF-30)