Dyson's purifying fan heaters combine intelligent sensing with an advanced filtration system. A filter removes gases and odors, and a Hepa filter captures 99.97% of particles 0.3 microns in size. Powerful Air Multiplier technology purifies and heats the whole room. Tested In maximum setting for air projection, tested in Auto mode for purification coverage, tested for room heating per relevant Dyson method DTM961.²Not applicable to heating. 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. Particle challenge by Dehs oil specified in EN1822 within a chamber specified in Astm F3150. Gas capture rate may vary Tested per Iso 29463 Fan not air conditioning unit.