Holmes highefficiency HEPA type Helps remove 99 of airborne particles and allergens from indoor air This compact air purifier features carbon filtration system that reduces unpleasant odors The HEPA type air purifier captures particles as small as 2 microns so you can breathe comfortably Designed to operate quietly, ideal for use in rooms up to 110 square feet and includes one aer1 filter Replacement filter use AER1 Filter, Skus 168874 and 152696