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These two processes are similar from a physical point of view, since they are characterized by the movement and replacement of air. But they also have significant differences.
A draft is a flow of air that blows through a room through openings that are located opposite each other. This is a “room wind” that occurs when doors or windows in opposite parts of the greenhouse are opened at the same time. In this case, uncontrolled air exchange occurs.
Ventilation is natural air exchange that does not require additional effort. This is done by opening the windows located on one side of the greenhouse. In this case, air flow circulation should be created throughout the entire area of the room.
Why should you avoid drafts in Your greenhouse?
Despite the fact that both procedures provide air replacement, ventilation is necessary for plantings, and drafts are harmful to them. It disrupts the microclimate around plants and replaces moisture-saturated air with dry air. As a result, the evaporation process is activated, which leads to drooping and wilting of the leaves. In addition, a draft causes a sharp temperature change, which causes thermal shock in plants. This can cause even the most unpretentious greenhouse crops to catch cold.
Please note! A draft is especially dangerous if the air flow speed exceeds 1 meter per second..
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