Honeywell True HEPA 310 sq. ft. Allergen Remover Air Purifier Great for large rooms Helps reduce VOC's and certain airborne germs from the air that passes through the filter 0.3 microns or larger based on independent testing rpt 100954017COL-001 when used with odor reducing pre-filter Carbon activated pre-filter helps capture larger particles before they enter the HEPA filter and helps reduce odors when used with odor reducing pre-filter Easy tap controls 4 cleaning levels, including allergen, germ and turbo power cleaning levels Automatic shut-off timer, 2, 4 or 8 hours Control panel light dimmer Needs 2 new air filters and pre-air filters. Retails for $219 + tax at Home Depot.