Vornado AQS35 True HEPA 5-Speed Air Purifier 5-speed air purifier for rooms up to 395 square feet Changes the air in a room up to 6 times per hour; whisper-quiet operation Top-mounted controls; upward clean-air delivery; flat back; built-in handles 1 True HEPA filter and 3 PreSorb carbon prefilters included Measures 10-1/4 by 13-4/5 by 21-3/5 inches; 5-year limited warranty