Could anybody explain to me if I open two windows in my home, when there isn’t any wind outside, why a cross draft occurs and would there ever be an instance where a cross draft couldnt happen even if its windy?
In addition to what’s already been mentioned, it’s very rare for there not to be any wind at all. And even 1-2 m/s, which feels close to nothing, will create a pressure difference between two sides of the house which can translate into more wind through a small opening.
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