Titanium dioxide coated screen boosts UV performance. Ultraviolet bulb helps remove airborne germs, bacteria and other microorganisms. HEPA filter traps 99.9% of dust and pollens down to 0.3 microns. Rinsable pre-filter catches lint, pet hair and other large particles. Charcoal filter absorbs airborne odors. Ionizer emits negative ions into the air that cling to and weigh down airborne dust, pollens and germs, making them easy for the filter to trap. Air Cleaner Machine Type: HEPA; CADR: 214; Maximum Room Size (Square Footage): 144 sq. ft.; Maximum Room Size: 12 ft. x 12 ft.