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Featuring 3M carbon web technology, the Filtrete odor reduction dual-layer 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 caused by: pets, Tobacco smoke, cooking, mildew, and cleaning chemicals. The Filtrete odor reduction lasts 25 times longer and is more effective at capturing odors inside the home while maintaining airflow (based on comparison of organic vapor capacity vs. Other national retail furnace filter brands)