The latest generation 3-in-1 Dyson Purifier Humidify+Cool Formaldehyde™ combines intelligent sensing with an advanced filtration and humidification system to purify, humidify, and cool you. ¹Third party full machine testing based on GB/T 18801-2015. Results may vary in practice. ²Tested for air projection (DTM801) and humidification (TM-002110). ³Particle challenge by DEHS oil specified in EN1822 within a chamber specified in ASTM F3150.