The OEM Honeywell Enviracaire 50250S Air Purifier is designed to work in large areas up to 390 square feet. It effectively removes 99.97% of airborne particles, including pollen, cat dander, and tobacco smoke. This model features three speeds, a clean filter reminder, and a patented 360-degree air intake and discharge system. Additionally, the carbon prefilter helps reduce odors and extends the life of the HEPA filter. Overall dimensions are 18"W x 18"D x 19-9/16"H.