Holmes True HEPA 3 Speed Tower Allergen Remover, HAP716-U Tower allergen remover for rooms up to 150 square feet True HEPA filter removes up to 99.97-percent of airborne allergens Traps dust, pollen, mold spores, pet dander, and smoke 3 speed settings; optional ionizer; washable pre-filter; filter-life monitor Measures approximately 11 by 8-1/5 by 28-2/7 inches Filters: Any Holmes AER1 Series, Holmes HAPF300D-U2 TRUE HEPA or Holmes HAPF30D-U2 HEPA Type Filter & a Holmes Arm and Hammer Carbon Filter.