Holmes HAP412BN-U HEPA-Type Mini Tower Air Purifier 3-speed mini air purifier for rooms up to 120 square feet (10 by 12 feet) HEPA-type filter removes up to 99-percent of airborne particles as small as 2 microns Fortified with Arm & Hammer baking soda to eliminate odors; optional ionizer Quiet operation; space-saving tower design; AHAM certified and UL listed Measures approximately 11-3/8 by 8-2/9 by 15-2/3 inches