The Dyson Purifier Cool purifying fan combines intelligent sensing with an advanced, fully sealed filtration system. It s engineered with two phases of purification so what goes inside stays inside. The Hepa filter captures 99.97% of particles 0.3 microns in size, and powerful Air Multiplier technology purifies the whole room and cools you. ² Tested per Dyson internal test standards for whole-room air projection (Tm-005021) and purification coverage (Tm-003711). ²Fan, not an air conditioning unit. 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. Tested per Iso 29463.