We spend up to 90-percent of our time indoors. and with harmful airborne particles such as dust, smoke, chemicals and mold circulating in the air we breathe, that makes breathing contaminated air unhealthy. The Luma Comfort AP170W PureClean Air Purifier removes harmful airborne particles in small to medium size areas up to 170 square feet. Designed for localized particle removal, this compact air purifier is ideal for use in bedrooms and small offices. Once contaminated air is drawn into the unit, it"s passed through the Luma Comfort PureClean advanced 5-step purification system: • Step 1-Carbon pre-filter deodorizes the air and traps larger particles such as dust, pet dander and lint • Step 2-HEPA filter traps over 99-percent of some of the smallest particles down to 0.3 microns • Step 3-VOC filter absorbs volatile organic compounds (VOCs), which are carbon-based airborne chemicals commonly found in wall paint, carpet, varnishes, solvents and more • Step 4-TiO2 filter is coated with titanium dioxide, which, when working with a UV light source, destroys harmful gases and bacteria • Step 5-UV bulbs destroy biological contaminants such as bacteria, viruses and mold The AP170W PureClean Air Purifier also features a sleek, space-saving flat panel design with LED control panel and has a Smart Clean sensor that detects and alerts you when the filters need to be replaced.