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Pre‐dimensioning of ventilation openings in double façades Double façades improve sound insulation while natural ventilation and offer the shading in the space between the façades, protection from higher wind loads. With regard to natural ventilation, however, it should be noted that the air flows must pass through two façade layers and the air exchange rate cannot be planned with the existing assumptions for single‐skin façades. The potentially higher temperatures in the intermediate façades space also require special consideration when planning summer heat protection. Climate data were recorded, and air exchange measurements were taken on 10 buildings in Hamburg with corridor double façades and box window double façades. Based on these data, a calculation approach of the outdoor air exchange was created and applied in transient thermal building simulations. A method was created with which the required size of the ventilation openings can be determined quickly and without software application in early design phases. [ABSTRACT FROM AUTHOR]