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Product Description Cleaner air can be yours -- even with common household odor culprits living under the same roof. Filtrete Odor Reduction Air Filters feature a unique active carbon layer to help minimize strong odors while trapping dust and allergens. Go ahead and let life happen: The freshness of your indoor air is in good hands. From the Manufacturer 3M carbon web technology combines activated carbon with electrostatically charged fibers. The activated carbon is made up of many tiny pores. As air passes through the filter, odors and gases become trapped in the pores. This helps reduce odors in your home caused by: pets, tobacco smoke, cooking, mildew, and cleaning chemicals. The Filtrete carbon filter is the best at removing odors and airborne particles while maintaining airflow. The Filtrete carbon filter is significantly more effective at removing odors than other carbon filters based on a comparison of organic vapor capacity vs. other national retail HVAC filter brands.