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The office air cleaner OAC250 from 3M is designed for conference rooms or other large workspaces up to 16' x 20'. It features three fan speeds, a filter change reminder, an ionozer on/off switch, and a carrying handle for convenient transport. 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; under normal conditions, filter effectiveness lasts up to three months.