WEN 90243-026-2 1-Micron Inner Air Filters, 2-Pack (for the WEN 3410 Air Filtration System) Includes a set of two inner air filters to keep your air clean and breathable Remove particles down to 1 micron in size from the air Designed specifically with the WEN 3-Speed Remote-Controlled Air Filtration System (model 3410) Compatible with the majority of air filtration systems Properly combat respiratory illness and the other health risks of a dirty workshop