Each living area requires adequate and efficient air ventilation. So we can spend our time smoothly and with more quality. Consequently, ventilation also affects our health. Therefore, it is important to use air ventilation systems in single zones and multiple zones. There are several methods of ventilation that depend on our requirements. In the final thesis, we became acquainted with all the concepts that are crucial for the efficiency of ventilation, and also determined this experimentally. We did this with a carbon dioxide measuring line that was used as a tracking gas. We made two measurements. The difference between the two was that we switched off the tracer gas supply to the chamber much earlier in the second measurement and therefore obtained different results, which we eventually compared.