Big+Quiet is the biggest purifier from Dyson yet. HEPA H13 grade filter captures 99.97% of ultrafine particles as small as 0.1 microns. Activated carbon filter removes odors and gases. Senses and reports automatically on LCD screen. MyDyson - set schedules see reports and more. 10 Fan speeds and 10 Cool settings. Dimensions: 17.09"W x 16.34"D x 38.87"H.