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The extent of smoke spread during building fires is critical, as it can adversely affect both evacuation and firefighting intervention. Smoke migration can occur through structural gaps, the potential for which should be minimised. One way to exclude smoke is to pressurise the structure, and an important starting parameter for the design of this is to know the leakage areas. The need for knowledge of the size of structural gaps has been high since the inception of design methods. This article aims to identify the potential for improving the calculation procedures by using the results of measurements on existing smoke control doors in pressurised vestibules. In this section, the author presents the relevant literature on the leakage area of the openings and the air flow coefficient of the openings. It describes the measurement method for determining the air flow through doors and structures and the calculation procedure currently used.
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