Dyson Purifier Big+Quiet, covers up to 1076 sq.ft.10., The HEPA H13 grade filter captures 99.95% of ultrafine particles as small as 0.1 microns2, while an activated carbon filter removes odours and gases.Fully-sealed to HEPA H13: Two phases of purification sit within our fully-sealed machine to trap pollutants inside, removing them from the air you breathe. Giving you reassurance that what goes inside, stays inside.Activated carbon filter|2-year filter life, 11.8 kg,