Many modern farmers are turning to sealed greenhouses over traditional ventilated greenhouses. Heavy ventilation is required daily to combat overheating in your typical traditional greenhouse. When growing in this type of greenhouse, the goal is often to try to exchange the entire air volume inside the greenhouse every minute through the use of enormous exhaust fans. In greenhouses that provide supplemental CO2, exhaust fans continually exhaust warm, CO2-rich, and odorous air. Apart from increasing the risk of pests and pathogens, many territories prohibit exhausting untreated, odorous air outside. By keeping the conditioned air inside, sealed greenhouses can provide a solution to these problems.