The HEPA filter removes 99.95% of pollutants and particles such as bacteria and allergens. Two strong air streams are directed over a curved surface. They meet to form a cooling and purified air stream. This can be precisely controlled by adjusting the position of the dome to direct the airflow up or down. Removes 99.95% of allergens and pollutants. The unit's sealed filter system consists of an activated carbon filter and a HEPA filter. With this combination, gases and ultra-fine particles are filtered out of the air and trapped in the filter. Uniform 70° rotation. LED display, remote control, sleep timer function.