Hunter 30730 Quietflo HEPA Small-Tower, Three-Speed Air Purifier with Ionizer Air HEPA-purifier with ionizer for medium-size rooms Three-speed fan for controlled, quiet operation Filters all air in the room up to 6 times per hour CADR rated to filter rooms up to 147 square feet Active setting for efficient daily use; measures 11  by 12 by 24  inches (l x w x h)