FRESH AIR SPECTRUM, allows you to experience the stillness that follows a thunderstorm. A quiet world refreshed and cleansed by Naturally Occuring Ionization and Oxidizers. Every breath a pleasant reminder of what Truly Fresh Air should be. Now imagine all of that as you relax in the comfort of your Home, Office or RV. Silent Radiant Air Purification means there's NO Noise, NO maintenance, and NO Filters. Radiant Catalytic Ionization (RCI) gives you State-Of-The-ART Highly Effective Technology for reduicing smoke, odors, pollen, and abroad spectrum of Air Contaminants.