This study aimed to evaluate draught and ventilation effectiveness in the occupied zone of an emergency control centre room based on user complaints in Estonia. Three methods were employed: air movement speed measurement, air change efficiency assessment, and contaminant removal efficiency using CO2 as a tracer gas, supplemented by air jet visualization with a smoke cannon. Measurements were conducted during nominal ventilation rates with active cooling units operating under summer conditions. The results indicate that there is good mixing, but internal and solar heat gains induce large eddy type of air movement causing draft in some locations of the room. Complaints of stuffy air may be linked to elevated room temperatures, because ventilation effectiveness measurements confirm adequate outdoor air delivery to the occupied zone. However, merely reconfiguring existing HVAC room elements is unlikely to resolve user complaints. Improved air distribution is needed and is studied with preliminary CFD simulations. The impact of higher air movement speeds due to large eddy effects can also be mitigated by reducing heat gains. This study offers valuable insights and practical guidance for optimizing high-ceilinged control centre rooms.