Dyson Purifier Cool Formaldehyde TP09 (Nickel/Gold) 4.0 stars out of 5 from 101 Reviews. 101 Reviews. Purifies the whole room¹ and cools you. HEPA 13 filter captures 99.97% of pollutants as small as 0.1 microns.² Even destroys formaldehyde.³. Connects to the MyDyson™ app. Only at Dyson: Exclusive technology and Nickel/Gold colourway.