The Wells N1WL0171 HEPA/Carbon Filter Pack for M Series is a replacement filtration set designed for compatible M Series equipment. It combines HEPA filtration with activated carbon to provide two stages of air treatment. The HEPA filter traps small airborne particles, while the carbon layer helps absorb odors and certain gaseous impurities as air passes through the filter media. Regu... https://partsfe.ca/n1wl0171-wells-filter-hepacarbon-pk-as-m