The 6000 DX with the Exec blend of carbon is our largest unit, with the deepest bed of carbon available. This is a powerful air purification system designed to treat very heavy concentrations of chemicals and odors in larger confined spaces. The 6000 DX with Exec carbon offers a 36 lb., 3.5" extra-deep bed carbon filter for enhanced adsorption of airborne toxins, a micro-HEPA for particles and an easy-clean pre-filter. Additional options include UV light and Titanium Dioxide (TiO2).