Louver's design are play important role in designing an air intake system. On a gas turbine power plant application, this louver will redirect the air flow path into the compressor and for the system's internal cooling. However, the shape and design of the louvers will influence the performance of a gas turbine. Disturbed airflow across the louvers may cause pressure drop of the intake air, which leads to reduction of the turbine work output. In this research, the effect of varying the angle of attack on the airfoil and flat shape louvers are investigated. Airfoil louvers were based on the symmetrical 4-digit NACA airfoil shape, with its maximum thickness of 10 mm. CFD analysis was conducted by using the built-in Solidworks Flow Simulation to visualize the air flow behavior across the louvers at the angles of attack of 25o, 35 o and 45 o. The results revealed that the pressure drop is more prevalent in flat louvers as compared to airfoil louvers. Furthermore, the pressure of the airflow reduced more with higher angle of attack due to vortex formation