Holmes HAP716-U True HEPA 3 Speed Tower Allergen RemoverHIghlights: True HEPA filtration removes up to 99. 97 percent of airborne allergens such as pollen, dust, mold, pet dander and smoke from the air passing through it Unit features 3 speed settings, optional ionizer, and slim tower design Washable pre filter captures larger particles Optional ionizer assists in particle removal Filter life monitor alerts you when filter changes are needed to maintain maximum performance Recommended for rooms up to 150