Filtrete Allergen Defense Odor Reduction AC Furnace Air Filter, Guaranteed Airflow up to 90 days, Delivers Cleaner Air Throughout Your Home, MPR 1200, 16 x 25 x 1, 4-Pack Removes strong odors in your air from pets, cooking, mildew and smoke and starts working in minutes* {*Based on comparison of organic vapor capacity vs. other national retail furnace filter brands} 65x better at reducing odor than other leading brands** {**Based on comparison of organic vapor capacity vs. other national retail furnace filter brands} Featuring 3M carbon web technology, the Filtrete Odor Reduction filter combines active carbon with electrostatically charged fibers. As air passes through the filter, odors and gases become trapped in the pores of the carbon. This helps reduce odors in your home, including: pet odor, tobacco smoke, cooking smells, mildew, and cleaning chemicals. Designed with Filtrete Brand 3-in-1 technology from 3M to pull in and trap unwanted air particles while letting clean air flow through Carries a 1200 Microparticle Performance Rating (MPR) which equates to a Minimum Efficiency Reporting Value MERV 11