This is the X0577 Lennox Healthy Climate replacement filter by AIRx. It was designed to be a 100% compatible replacement for the original X0577 media furnace and AC air filter. In addition to capturing larger household particles like dust, pollen and mold spores, MERV 11 filters are also effective at capturing allergens like pet dander, dust mite debris and reduce odors from smoke, car fumes and smog. Change your MERV 11 filter every 90 days to protect your expensive HVAC equipment and improve the air quality in your home!