Coway 1008CHFS Air Purifier Filter Set The product includes a HEPA filter by 3M to kill and remove 99.97 percent of germs, bacteria, micro dust, and allergens and is designed to use for up to 3 years. Activated Carbon Deodorization filter can effectively remove odors in your room and can also be used for up to 3 years. It's the best choice for allergy sufferers and the actual unit is approved by the British Allergy Foundation and the Association of Home Appliance Manufacture AHAM in the U.S.