Great for medium to large rooms. Filters and circulates room air 5x per hour when used in the recommended room size 12 ft x 14 ft (170 sq. ft.). Helps capture up to 99.9 percent of certain bacteria and virus and harmful VOCs and odors with activated carbon pre-filter. Weighs only 10 lbs. One-touch LED electronic control and three levels of cleaning. Features a filter replacement indicator. To ensure stated product performance, use only Certified Honeywell Replacement Filters.