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Model-based analysis and simulation of the airflow control system of ventilation units is of primary importance for the design and maintenance of the entire HVAC system in building environments. In this paper, we develop a mathematical model to simulate such airflow control systems. The model is implemented and a systematic analysis of the system is carried out, including its dynamic simulations in SIMULINK. The simulation results are compared with data obtained from analytical predictions as well as with experimental results available for a lab-scale ventilation unit. Finally, based on the combination of temperature and airflow regulations with conventional PI controllers, we provide the results of simulations of the entire ventilation unit control system for two different types of loading conditions. r