During the BlowerDoor building test, it must be ensured that all building parts of the test building or the test section have air connection, and that the test object can be considered one single zone. This also applies to large buildings like office buildings, schools, indoor pools, etc. with several floors and winding floor plans. Overly tight airflow paths from the leakages to the measuring device prevent an even pressure distribution. The pressure differences inside the building should be less than 10% of the pressure differential between the interior and the exterior. In testing practice, most pressure distribution considerations are theoretical. Which approaches in measuring technology are available to improve knowledge of the actual pressure distribution, and thus the evaluation of the measurement results? What do the results look like? What possibilities are there to conduct a measurement even in critical conditions?