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The shape and configuration of the air ventilation system determines the ventilation performance while influencing the design and structure of a car. It is therefore necessary to decide the configuration of the air ventilation system in the early stages of design. We tried to analyze the pressure level of the ventilation ducts from the aerodynamics simulation results added to the cowl top which had the ventilation intake duct, and so on. Thus we succeeded in designing a new development process that can be used to predict the ventilation performance in a shorter time without the use of prototypes.