Holmes True HEPA Allergen Remover Air Purifier with Digital Display for Medium Spaces, White True HEPA filtration removes up to 99.97% of airborne allergens from air that passes through the filter Arm & Hammer enhanced filter helps eliminate common household odors Digital display with four speeds and timer, which allows to automatically run the air cleaner for up to 16 hours. Filter monitors alert you when filter changes are needed to maintain maximum performance Recommended for rooms up to 256 sq ft (16ft x 16ft), Smoke CADR 169 Recommended Filters: Holmes HAPF600D-U2 True HEPA Filter & Holmes HAPF60-U3 Carbon Filter