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Shop HEPA type replacement filters for the Alen BreatheSmart HEPA Air Purifier. Choose from four filter options: HEPA-Pure for allergy and asthma relief; HEPA-Silver to address allergies and asthma with additional protection against bacteria; HEPA-FreshPlus for increased protection against allergies, asthma, chemicals, and cooking odors; and HEPA-OdorCell with additional defense against smoke and pet odors.