Remember when your workshop was full of clean air? Air-borne dust particulates can dirty up a woodworker's workshop and harm a healthy respiratory system. With the WEN 5-Micron Outer Air Filters, you can rest assured that these particles will be properly filtered from the air. Although these filters were designed specifically for the WEN 3-Speed Remote-Controlled Air Filtration System (model 3410), they will also fit in the majority of other air filtration systems. Each order includes two outer air filters with easy and fast tool-free installation.