The heart of the semi-closed greenhouse is our Dalsem AIR Semi-Closed System and an essential part of the energy-efficient climate control system. A solution that combines decentralized forced air ventilation and circulation to resemble natural airflow from above to the crop. By circulating and mixing greenhouse air with outside air or air from above the screens, optimal growing conditions are created inside the greenhouse. A practical and compact ventilation system which is strategically placed to cover the entire greenhouse resulting in less energy use, less risk and more production.