DESC: HONEYWELL True Hepa Filter Removes 99.97% Of All Airborne Particles As Small As 0.3 Microns, Including Pollen, Dust, Smoke And Other Sources Of Indoor Allergens. Activated Carbon Prefilter Reduces Odors. Patented 360° Airflow And Surround Seal Maximizes Efficiency. Includes Lifetime Hepa Filter System And Intelliclean Electronic Filter Monitor To Remind You When To Clean The Lifetime Hepa Filter And To Replace The Prefilter. Air Cleaner Machine Type: Hepa; Cadr: 250; Maximum Room Size (square Footage): 374 Sq. Ft.; Maximum Room Size: 17 Ft. X 22 Ft.