WEN 90243-027-2 5-Micron Outer Air Filters, 2-Pack (for the WEN 3410 Air Filtration System) Includes a set of two outer air filters to keep your air clean and breathable Remove particles down to 5 microns 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