What is the deal with positive pressure?
Positive pressure is basically when you have more air blowing into your terrarium than can escape at once.. creating a positive airflow.. constantly “pushing” air out. Ideally this is achieved by a tightly sealed chamber and the CO2 exhaust holes near the bottom, collectively smaller than the diameter of the humidifier hose coming in. This creates a positive air pressure that helps prevent contaminants from entering. Although this is not necessary, it gives some growers peace of mind that their fruiting chambers are less susceptible to contamination.
