Dyson engineers and research concluded that to clean an entire room properly, you need to sense pollution events automatically; capture ultrafine pollutants; and project cleaner air around the room using Air Multiplier technology. The Dyson purifying heater + fan is designed and tested to do all of this. This item is a manufacturer-refurbished product. It has been inspected, cleaned, and repaired to meet manufacturer specifications and is in excellent condition. The refurbishment process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships in a generic box.