The Air Quality System 500 whole room air purifier. Draws air in through two High Allergen / Maximum Dust air filters trapping Pollen Pet Dander Bacteria Mold Spores Dust Mite Debris and Smoke Particles. The Vornado Air Purifier uses Vortex Technology to fully circulate the air in the room. Air cleaners that do not fully circulate the air only clean the immediate area around the unit. Offers superior performance and near silent operation as quiet as a personal desktop computer on low speed. Equipped with LED indicators that display personal settings. This air purifier features 3 speeds timer and a change filter indicator to aid in the timely replacement of filters. 2 Filters included. Does not emit ozone.