TopoLite 4" Inline Fan Carbon Air Filter Ducting Combo for Grow Tent Ventilation Exhaust Kit and Hydroponic Growing System

4" Activated Carbon Filter: 4" Flange: 10"H x 7"D Iodine Adsorption Value: 950 (High efficiency) Carbon Layer Thickness: 1.5 inches Specific Surface Area: 900-1000 square meter per gram Max. Endurab..