Made from electrostatically charged polypropylene fibers this purifier works like a magnet to attract and trap airborne particles Exclusively developed for 3M it filters 99.9% of pollutants in indoor air to reduce allergens in the environment Its multi-functional design works as an activated carbon purifier able to eliminate dust, dust mites, smoke and pet dander Recommended for use in up to 22 sq. meter room Includes a 2 year replacement warranty