The Whirlpool Tower Air Purifier features HEPA filtration, capturing 99.97% of particles as small as 0.3 microns. This purifier removes airborne allergens from rooms up to 200 sq. ft., and does so 4.8 times per hour. The VOC sensor detects compounds, gases and fumes, and a charcoal pre-filter pre-cleans the air of these VOCs before it even reaches the HEPA filter. Additional features include three fan speeds, sleep mode, auto mode and a timer that goes up to 18-hours.