This is the 259112-105 Trion replacement filter by AIRx. It was designed to be a 100% compatible replacement for the original 259112-105 media furnace and AC air filter. MERV 8 filters offer superior airflow and capture larger household particles like dust, pollen and mold spores to keep your ducktwork, equipment and household surfaces clean. Change your MERV 8 filter every 90 days to help extend the life of your expensive HVAC system!