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Humidity can be controlled in the greenhouse by forced ventilation i.e. exchanging humid air inside the greenhouse with dry air from outside the greenhouse withe the use of fans, suction ventilators, and a distribution system. Outside air almost always contains less moisture content than the greenhouse air. The dry air blown in displaces the humid greenhouse air outside, lowering the humidity. The exchanged dry air can be distributed across the greenhouse by sleeves below the (hanging) gutters or above the crop. The dehumidification capacity of the system is the maximum amount of air blown into the greenhouse by the forced ventilation, in m3 per m² per hour.
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