A carbon filter is optional. An intake fan will be needed at some point for air exchange. CO2 is needed for plant growth and so once the plants use up the CO2 in the grow space, the plants growth will slow down. An intake fan will exhaust depleted air out and bring fresh CO2 in.
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A carbon filter is optional. An intake fan will be needed at some point for air exchange. CO2 is needed for plant growth and so once the plants use up the CO2 in the grow space, the plants growth will slow down. An intake fan will exhaust depleted air out and bring fresh CO2 in.