The Dyson purifier humidifier is engineered to help improve your air quality. An advanced filtration system combines a filter to remove gases and odors with a Hepa² filter to capture 99.97% of particles 0.3 microns in size. Powerful Air Multiplier technology projects purified, humidified air throughout the room. Tested for air projection (DTM801) and humidification (Tm-002110).²Particle challenge by Dehs oil specified in EN1822 within a chamber specified in Astm F3150. Requires device to run app, Wi-Fi or mobile data, Bluetooth 4.0 support, and iOS version 10 or Android version 5 (or above). Standard data and messaging rates may apply. Refer to the MyDyson app for compatible voice services. Based on fan speed 1. Gas capture rate may vary Tested per Iso 29463 Fan not air conditioning unit.