my grow im planning would be just one plant and im simply wondering whether or not to leave intake/exhaust fans on 24/0? Its going to be a small plant with 4 cfl's (wattage yet to be determined) so i dont think temps are a factor. i scanned google but couldnt find anything solid. so, how long should i have my fans running for in a small grow box? just during light hours? all the time?
in a small grow box you're going to want to leave them running all the time in order to exchange the air inside the box effectively. The plant can only use the CO2 immediately in the area around the leaves, so you have to ventilate well in order to have a healthy plant.