The studies of tubulence flow can be traced back to five centuries ago. It represents part our daily life as the application related to turbulence flow is everywhere. A wind tunnel is important for university students to study and visualize the fluid behaviour as it transits from laminar to turbulence or passing through an object. This research project aims to demonstrate appropriate performance criteria, which has turbulence intensity in the test section to be generally more and less 5% for a subsonic wind tunnel.