This study quantitatively analyzes the parametric impact of damper angles on airflow in a rectangular duct through using computational fluid dynamics (CFD) simulation. Since a volume damper is important primarily to provide proper airflow to different zones, it can be critical to maximizing performance in an HVAC system. The duct airflow is applied in practice and previous researches have explored the manual flow control system methods, but the use of simulation can assist in the setup before fabrication as well as the actual automated control in subsequent applications depending on the occupant within a zone. The main objective of this work is to investigate the impact of various damper positions on airflow velocity, pressure distribution and volume flow rate per zone inside the system. The parametric study will be performed using SolidWorks Flow Simulation. This method measures those quantities to determine the prescribed damper positions, relative to the prescribed occupancy airflow as stated in ASHRAE 62.1. Expected results indicate that the positioning of damper changes airflow behavior and causes changes in both volumetric flow rates and static pressure losses in each zone. The findings are expected to highlight the importance of adjusting damper angles for the purposes of reducing energy waste and improving ventilation. The recommendations could well be more geared toward smart damper control strategies to increase HVAC efficiency by minimizing unnecessary static pressure losses.