Apollo Horticulture 8" Inch Premium Carbon Charcoal Air Filter Scrubber 1 - 8" Apollo Horticulture Premium Carbon Air Filter Air Flow - 730 CFM / Dimensions: 11.75" x 25.50" with 8" Flange Ducting RC 48 Virgin Activated Carbon / Aluminum Cap Construction for Maximum Output 50mm Carbon Layer of Thickness for Higher Absorption and Performance Package Includes: 1 - 8" Carbon Filter / 1 - Pre Filter