The KBX600 600 CFM uses the air cleaning power of High Efficiency Particulate Air HEPA 99.97% filters, which captures all particles greater than .3 microns. Dual UV lights are housed inside the unit with reflective insulation creating more light angles that attack molds, bacteria and pathogens. A Needle Point Bi-Polar Ionizer releases ions that become attached to smaller/lighter particles that can now be captured and eliminated. The KBX600 can be used as either an HEPA Filtered air cleaner or as a filtered negative air machine. When used to create a negative pressure, the unit removes potentially contaminated air from the space and pulls in fresh air from outside of the space. An optional charcoal filter to reduce odors is also available for both models. This model has an additional HEPA filter.