It combines a precise solid-state formaldehyde sensor with a unique catalytic filter that continuously destroys formaldehyde. HEPA H13 and activated carbon filters also capture dust, allergens, gases and other ultrafine pollutants. And Dyson purifiers have powerful Air Multiplier technology to purify the whole room.41. Third party full machine testing based on GB/T 18801-2018 formaldehyde cumulative clean mass testing with continuous injection until plateau of formaldehyde CADR is achieved. Results may vary in practice3. Gas capture rates may vary.4. In maximum setting. Tested for air projection, purification coverage in a 81m3 room.