Electrolux PureOxygen Allergy 300 HEPA 4-Stage Filtration Air Cleaner / Air Purifier, White Premium HEPA filtration absorbs 99.97% of dust and allergens from the air down to 0.3 microns in size Activated carbon filter helps reduce odors and some gasses in your home Cleancel treated carbon filter includes a coating of Cleancel - a chemical compound that impedes the growth of bacteria and molds Change filter indicator will automatically let the user know when it is time to replace the filters Replacement filters for this model are EL047 HEPA and EL048 Carbon