by Jorge Cervantes
Air
Fresh air is necessary in all indoor gardens. It is easy to obtain and inexpensive to maintain. Air ventilation often makes the difference between a heavy harvest and crop failure. Fresh air brings carbon dioxide (CO2) necessary for plant life into the room. A god ventilation system expels CO2-poor air. Air ventilation is also essential to keep temperature and humidity at proper levels for fast plant growth. Both intake and exit vents are essential for adequate airflow in and out of the grow space. A circulation fan is also necessary to keep the air from from stratifying into hot and cold layers inside the room.