G-LEAF 6 Inch 530 CFM Inline Fan+Carbon Air Filter+Variable Speed Controller+25-Feet Air Ducting With 2 Clamps Combo 6 Inch 530 High CFM Quiet Inline Fan 6 By 16 Inch Carbon Air Filter Dia 6 Inch By Length 25 Feet Air Ducting With 2 Durable Clamps With Free Duct Tape(Width 2-Inch, Length 20-Yard Per Roll) This Combo Brings In The Fresh Air And Removes Heat From The Grow System