PrimeGarden 4'' Inline Fan Carbon Filter Ducting Combo + Variable Fan Speed Controller + Hygrometer Thermometer + 24 Hour Timer Outlet for Hydropon...

Activated Carbon Filter:Overall Size:4" Flange:10"H x 7"DIodine Adsorption Value: 950 (High efficiency)Carbon Layer Thickness:1.5 inchesSpecific Surface Area: 900-1000 square meter per gramMax. Endura..