The sleek and compact device incorporates 4 of the most effective purifier technologies all in sequence to better clean your air. The polluted and contaminated air begins at the Active carbon pre-filter, which traps carbon and charcoal particles in your air. Next, the air purifier uses an industrial strength filter, the True HEPA (High Efficiency Particulate Air) filter, to trap in and other large particles like dust, smoke and bacteria. The remaining microscopic particles, like mold and fungi are destroyed by the TI02 encased UVC Lamp. Lastly, the 9020 expels negative ions to weigh down any particles or contaminants that may later enter the area.