Why a carbon filter?
A suitable activated carbon filter is an important part of your ventilation system when you grow indoors. There are strong odors that can be quite annoying to you and the people around you. Because your ventilation system does exactly what it's supposed to do: blow out warm air, but with it also everything in terms of odor that has previously developed in the tent.
The activated carbon filter offers a solution and counteracts this by filtering the odor molecules from the air: the porous structure of the carbon it contains and the enormous inner surface ensure that the undesirable substances precipitate.