The Vornado AC300 Whole Room Air Purifier uses true HEPA filtration, the most effective filtration available, to remove up to 99.97% of airborne allergens down to 0.3 micron in size. The Vornado Whole Room Purifier actively circulates and filters all the air throughout a room. Without powerful circulation, the air cleaner is only cleaning the immediate area around the unit. The AC300 uses a radial blower to intake and clean all the air in the room- up to 220 sq. ft. Precision engineering allows the blower to operate quietly, despite it's powerful air flow. The AC300 uses a combination of HEPA and carbon filtration to trap Dust, Pollen, Pet Dander, Smoke, Bacteria, Mold Spores, Dust Mites and more. The carbon prefilter both adsorbs odors and traps larger particles. Features 3 speeds, push button electronic controls, filter replacement indicator and industry leading 5 year limited warranty.