The Airflow Systems Model 500 is a high-efficiency air cleaner that can remove annoying smoke, odors, dust, and dirt from offices, break rooms, cafeterias, and computer rooms. This air cleaning unit can be conveniently hung on the wall. The non-electrostatic design of these air cleaners eliminates the problem of snapping and popping common with old-fashioned electrostatic models. Washable pre-filter, a primary box filter, and optional HEPA after-filters combine to provide 99.97% filtration efficiency at noise levels as low as 54 dBa.