Holmes HAP8615-U Allergen Remover for Small Rooms Allergen remover for rooms up to 116 square feet True HEPA filter removes up to 99.97% of airborne allergens Filter fortified with Arm and Hammer Baking Soda eliminates odors; optional ionizer 4 speed settings, filter-life monitor indicates when filter needs to be changed Allergen remover for rooms up to 116 square feet True HEPA filter removes up to 99.97-percent of airborne allergens Filter fortified with Arm & Hammer baking soda eliminates odors; optional ionizer 4 speed settings; filter-life monitor indicates when filter needs to be changed Measures approximately 12-3/5 by 9-4/5 by 15-3/5 inches