Enjoy peak ventilation experience with Mars Hydro Inline Fan & Carbon Filter Combo Package Include: 4" inline duct fan with speed controller, 4" carbon filter, 33ft length flex ducting,3 Duct Clamps. Only the Canadian version is different in color and has the same devices and functions …
Refreshing Your Grow Room: Mars Hydro inline fan and filter kits are designed to quietly ventilate indoor grow rooms/tents, transfer heating/cooling air in and out, and eliminate odors.