The Wells N1-WL0171 HEPA/Carbon Filter Pack is manufactured to fit the M Series air purifiers only to provide clean air indoors. It has a two-part filter system a HEPA filter that removes 99, 97% of airborne particles including dust, allergens, and pollen as well as an activated carbon filter that traps smell, chemical vapor, and toxic gases. A component that can be easily exchanged; it improves the efficiency of the purifier thus making a home a healthier place to live. Ideal for use in homes or offices, the filter pack is designed to serve you for a long time and is therefore useful, especially for those with allergies