Firstly, it depends on the type (indoor or outdoor) and size of the tunnel. Overall size of the wind tunnel depends on the flight zone, which varies from 2 m to 6 m in diameter. Secondly, it depends on the location and the individual details of the whole building. Estimated total costs of a vertical wind tunnel project vary from 0.7 to 1.7 million EUR for compact class models. The investment for PRO models with premium level support building vary from 3 to 10 million EUR.