Dyson Purifier Hot+Cool Formaldehyde Purifying Fan Heater 2021 automatically detects formaldehyde, airborne particles and gases. then diagnoses and reports them in real-time. 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 older ultrafine pollutants. Dysons Air Multiplier technology generates the circulation power to purify the whole room.