EnergAire Ionizer Breathe air free of smoke, pollen, and pollution. Cleans up to 4,000 cubic feet of air (a large room). Removes tiny particles in the air not removed by any other method of air purification. No noisy fans, no filters to clean or replace, no rods to clean. Rated #1 in the removal of cigarette somke by the leading U.S. Consumer Protection Magazine.