The Soler & Palau 990447 Universal Filters 3-Pack is a set of MERV 8 replacement filter media designed for Soler & Palau TR Series Energy Recovery Ventilators (ERVs), including TR90(G), TR130, TR200, and TR300 models. Made with antimicrobial polyester fibers, the filters use a three-stage filtration process to capture airborne particles and prevent dirt from passing through. https://www.partshnc.com/soler-palau-990447-universal-filters-3-pack