Hi all a noob question, but if you have your light in a cool tube, and are running Co2 and are controling the humidity do you need an intake or exhaust fan?

thanks in advance!

OSCILATING FANS

An oscilating fan is a necessity to me, in growing.
First it cools the area. Consider in nature, outdoors, plants get breezes and strong winds blown on them, for a reason.
Second, you know how to strenghten a muscle, or make it larger, or stronger or grow faster? You exercise it, you MOVE it.
To strenghten a plants stem, stalk or branch, or make it larger, or stronger or grow faster, you MOVE it too, with an oscilating FAN blowing on it.

Fans help with Temps, Humidity Control, Moisture Control, etc.

Air movement is very necessary for the health of your plants, but too strong of a fan can cause wind burn. Direct your fan toward the tops of the plants and toward the lights. Never position the fan blowing strongly downward on the leaves or you can get wind burn.

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