The Wells N1WL0171 HEPA and carbon filter pack is a replacement filtration assembly designed for compatible M Series equipment. It combines HEPA filtration with carbon media to process air passing through the filtration system. The HEPA component captures airborne particles, while the carbon section adsorbs certain odors and gaseous contaminants. Together, these filtration stages supp... https://partsfe.com/n1wl0171-wells-filter-hepacarbon-pk-as-m/1-N1WL0171.html