Our first 3 Plate system delivers unsurpassed results. Unclean air is first passed through the Pre-filter, HEPA filter, odor fighting filter, and finally the Photo Catalytic (PCO) filter. Only Green Air Deluxe features this quadruple air filter system, making the air in your home wonderfully clean. The anion emitters, now moved forward of the fan to the front panel, release trillions of negative ions into your home, attaching themselves to dust particles, and dropping them straight to the floor. This advanced function is ideal for eliminating dust, animal dander, and other harmful particles that float in the air. The Green Air Deluxe also features a UV lamp. When you need to eliminate strong or offensive odors in your home, the ozone mode purifies the air based upon the square footage of your home. Perfect for eliminating tobacco smoke odors, cooking odors, chemical/cleaning agent odors, paint odors, etc. The ozone will also eradicate pollution embedded in walls, ceilings, floors, carpets, furniture, clothing, countertops....all surfaces in your home. Use ozone mode when home is unoccupied on units built in timer, and not around people with asthma or respiratory issues. Exclusive to this unit is a dual timer function that will allow you to have the unit turn on and off at preselected times daily, as well as a separate ozone timer that will turn the ozone function on and off at preselected times while the unit is running.