Hydroponic Filter - Value Pro 4" x 14" Activated Carbon Air Filter Flange Diameter: 4" - Height: 14" - Carbon Height: 12" - Width: 7" - Carbon Thickness: 1.5" Maximum Airflow: 200 CFM - Carbon Volume: 311 Cubic Inches - Iodine Absorption: 950mg/g Premium quality activated carbon - Cotton pre-filter included Removes 99.5% of airborne odors - Carbon removes particles equal to 108% of carbon weight 12 Month Average life expectancy