Automatically senses, captures and traps pollutants for cleaner air. HEPA filter removes 99.97% of particles 0.3 microns in size. Intelligently purifies and cools you. The purifier is fully sealed, so what goes inside stays inside. Two phases of purification sit within our fully sealed filtration and airflow system. Air Multiplier technology generates the circulation power to draw distant pollutants into the machine, projecting purified air throughout the whole room.¹ Automatically senses and reacts to changes in air quality - then reports pollution in real time on LCD screen and on your MyDyson app.² Choose between Fan mode for direct cooling with your choice of 0 to 350° oscillation and Backwards airflow mode to purify without cooling. The filter is quick and easy to change. With automatic filter-life notifications on the LCD screen or MyDyson app. Program your machine to turn off after pre-set intervals between 30 minutes and 8 hours. In Night mode, the machine monitors and purifies using the quietest settings, with a dimmed display.