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Cross ventilation is air exchange through openings exposed to different external pressures, commonly on different sides of a space. Wind produces a pressure distribution around the exterior; flow through connected openings depends on the difference between their local pressures and the interior pressure established by the circulation.
For a simple steady incompressible estimate, an opening contributes a flow scale , with direction set by the sign of the local pressure difference. Both openings matter because the same air stream must enter and leave, and internal passages can add resistance. Changing wind direction can reverse or weaken the exchange even at unchanged wind speed. Combining opening-flow measurements with external pressure readings therefore tests the driving mechanism more directly than a single indoor temperature reading.