Dyson HushJet compact purifier is Dyson's most powerful, small-format purifier. Basing their design on that of jet engines, Dyson engineers developed HushJet air projection, which minimizes noise while purifying rooms of up to 203 sq ft. So, it s compact in size yet powerfully circulates air throughout the entire room. Allergens refer to non-living material. Filtration efficiency to Iest -Rp-CC001.7. Gas capture rates may vary. Electrostatic filter life tested to Gb/T 18801-2022 to a 50% decline in Cadr, based on 12 hours use per day. Filter life varies according to pollution levels. Tested for removal of grilled salmon and wet dog odors to EN13725. Requires device to run app, Wi-Fi or mobile data, Bluetooth 4.0 support, and iOS version 10 or Android version 5 (or above). Standard data and messaging rates may apply. Refer to the MyDyson app for compatible voice services.