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Dyson Purifier Cool Formaldehyde tower fan purifier. It combines an accurate solid-state formaldehyde sensor with a unique catalytic filter that continuously destroys formaldehyde. HEPA and activated carbon filters also capture dust, allergens, gases and other ultrafine contaminants. And Dyson purifiers feature powerful Air Multiplier technology to purify the entire room. Built-in sensors constantly analyze the air, while our unique algorithm crunches the data every second. It diagnoses contaminants at the molecular level, displaying live results on the LCD screen. The Dyson catalytic filter continuously traps and breaks down formaldehyde molecules into water and CO2. And you'll never have to change it.