Breathe easy with a Signature Series air purifier from Sensede by your side – clean air that keeps you balanced and healthy. The ACD-600FD Signature Air Purifier is a fully digital air purifier equipped with a multi-layer True HEPA filter system to remove ultrafine pollutants and allergens from the air. It also features a built-in air ionizer. Original Sensede replacement filters last up to a year. This air purifier is equipped with a smart air quality sensor that continuously monitors the surrounding air for pollutants. Set the air purifier to automatic mode so it can maintain air quality on its own. The device has excellent sound performance, with noise emissions of less than 35 dB when used in sleep mode.