Vacuum filters trap dust and allergens to keep them from recirculating in the air or entering the vacuum's motor. They're usually found near the vacuum's exhaust port to catch fine particles that haven't been collected in the vacuum bag or dirt cup. These filters are used for regularly replacing old filters to maintain suction and avoid motor burnout. They're also used to change out clogged or damaged filters. They typically fit specific vacuum cleaner brands or models.
Critical-Area Vacuum Filters