Dyson HP04A Purifier Humidify+Cool FormaldehydeDyson Purifier Humidify+Cool formaldehyde Detects and destroys formaldehyde, continuously Purifies and hygienically humidifies a whole room Lifetime solid state formaldehyde sensor Captures H1N1 virus A cleaner, more comfortable environment The Dyson purifier humidifier is engineered to help improve your air quality. Its activated carbon filter neutralises gases, its HEPA H13 filter captures 99. 95% of particles as small as 0. 1 microns3 and a