by Jorge Cervantes
Air Circulation
Marijuana uses carbon dioxide (CO2) from the air. The CO2 is used up quickly around foliage, and the air must be circulated so that new CO2 comes in contact with leaves. You will need an oscillating circulation fan to keep the air stirred up and CO2 readily available for plant intake. A circulation fan will als mix the hot air on top and cool air below so the temperature is even throughout the room.