3M Air Cleaner w/Filtrete For conference rooms or other large workspaces up to 16' x 20'. Help clean the air and reduce odors in your workspace. Three fan speeds. Filter change reminder. Ionozer on/off switch. Carrying handle. A three-stage filter design includes both Filtrete filter media and ionization for airborne particulate removal, and carbon for odor reduction. Many factors, such as smoke, can affect filter performance; however, filter effectiveness lasts up to three months under normal conditions. Five Year warranty on units. 320 CADR. Black and Silver.