Odor Relief filters combine particulate filtration with activated carbon for effective odor and gas removal. Designed to reduce dust, pollen, mold, and animal dander while targeting odors from smoke, cooking, pets, and other sources. Uses the same carbon media found in high-quality HEPA pre-filtration systems. Engineered to improve indoor air quality without adding chemicals or ozone. Carbon media actively helps reduce ozone exposure while supporting proper airflow. Durable double-wall construction with metal reinforcement. Dimensions shown are nominal. Actual sizes are slightly smaller. Standard and custom sizes are available. Sold in cases of 12 each for 1″ and 2″ filters, and 6 each for 4″ filters.