The Aerial Environment Good air exchange and circulation is a vital part of controlled environment gardening.
Plants increase humidity and use up available carbon dioxide rapidly.
Controlling temperature, humidity, and Co2 availability can be easily achieved with a squirrel cage blower fan and a length of flexible dryer hose. The fan is hung or mounted close to the ceiling than the floor, forcing warm stale air out through the dryer hose. Cool Co2 rich air is drawn in through cracks or vents closer to the floor. The fan may be cycled by a timer or connected to a thermostat or environment control device. This allows the grower to give the plants an optimum aerial environment at all times.