Oscillating air cleaner removes up to 99.9% up of all microscopic particles 0.3 microns & smaller from the air. Permanent ifD filter may be easily removed & cleaned, ensuring an extra-long, effective-use life. Odor-absorbing pre-filter helps reduce certain household VOCs & airborne gases. Three air cleaning levels (sleep, standard & max-power) take the guesswork out how to most efficiently clean the air of your home. Tower unit fully circulates the air in a closed room five times an hour, greatly reducing the amount of airborne dust, pollen, pet dander, smoke & allergens. Air Cleaner Machine Type: ifD; CADR: 150 (Dust); 160 (Pollen); 146 (Smoke); Maximum Room Size (Square Footage): 225 sq ft; Maximum Room Size: 15 x 15.