DESC: Restore the natural balance of the air in your home. The difference? Its patented carbon filament ionization system. How it works: First, the air passes through 5 layers of purification ensuring that dust and dirt are paralyzed in their tracks (all 5 layers are self-contained in a single easy-to-clean air filtering cassette that never needs replacing). Second, once the air is cleansed, the patented carbon filament gives the air its power-punch scrubbing ionizing (carbon is a magnet for odorous contaminates too).