Holmes True HEPA Air Cleaner and Odor Eliminator with Digital Display for Large Spaces, HAP756 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 Filter monitors alert you when filter changes are needed to maintain maximum performance Recommended for rooms up to 340 sq ft (20ft x 17ft), Smoke CADR 270 Recommended Filters: Holmes HAPF600D-U2 True HEPA Filter & Holmes HAPF60-U3 Carbon Filter