The Hort2O Carbon Filter is available in either 4" or 6" and features aluminum flanges, steel meshing, and clothed pre-filter. Utilizes virgin charcoal to provide filtration to your indoor growing ventilation system.
Duct Opening: 4”, Length: 16", Airflow Rating: 115 - 225 CFM
4" flange is compatible with Hort2O 4" Inline Fan with Speed Controller.