Is an efficient, carbon filled filter media that provides low resistance and a high capacity. Its gas phase, 60% activity granular activated carbon has nearly five million square feet of surface area per pound, and is designed to remove odors and gaseous pollution from air. Offered in a variety of sizes and thickness, Carbon media can be used to create your own filter design. Efficiency: 5 mic. to 20 Mic., Rated air flow M³/h: 800 to 3200, Initial resistance: 40 pa.