Hydroponic Filter - Magnum Pro 6" x 26" Activated Carbon Air Filter 18 Month Average life expectancy Built-in Reversible Flange (NEW!) Maintenance free design, Premium quality activated carbon, Cotton pre-filter included Flange Diameter: 6", Height: 26", Carbon Height: 24", Width: 10", Carbon Thickness: 2" Maximum Airflow: 550 CFM, Carbon Volume: 1206 Cubic Inches, Carbon Rating: RC-48, Iodine Absorption: 1050mg/g