When envisioning the future of vessel design, considerations for heating, ventilation, and air conditioning (HVAC) may not always take precedence. Yet, the significance of proper HVAC systems cannot be overstated, particularly when it comes to ensuring optimal passenger experience. Among the critical aspects of HVAC, ventilation and air circulation onboard vessels stand out as pivotal factors in maintaining healthy and clean air environments.In this paper, we delve into the key role that Computational Fluid Dynamics (CFD) analysis plays in optimizing vessel ventilation systems.