G-LEAF 6 Inch 530 CFM Inline Duct Fan & Carbon Air Filter and 25-Feet Ducting With 2 Clamps Combo 6 Inch 530 CFM Inline Duct Fan 6 By 20 Inch Carbon Air Filter Dia 6 Inch By Length 25 Feet Air Ducting With 2 Free Durable Clamps Bring In The Fresh Air And Removes Heat From The Grow System