Office Air Cleaner with Filtrete filter helps purify the air in your office. Designed for offices or other work spaces up to 256 square feet (16' x 16'). Three-stage filter design includes both Filtrete filter media and ionization for airborne particulate removal, and carbon for odor reduction. Office Air Cleaner offers a slim design, three fan speeds, ionizer on/off switch, carrying handle and filter change reminder. Filter effectiveness lasts up to three months under normal conditions.