Trouble Defining Flow Volume

i am trying to simulate air flow and ventilation inside an box containing electrical components with varying degrees of power dissipation which will produce heat. Right now i am having some issues defining the flow region of air inside the box. I can select a seed face and boundary as the tutorials show but i receive errors saying that flow volume is infinite? Can anyone help me understand what i am doing wrong>

Thank you.

Hi, and thanks for using the forum.

Please always include a link to your project so we can look for the source of the problem.

sorry, heres a link


I was able to create the flow region as you can see in my copy of the project:

The problem was an interference between these two parts:

I solved the issue by deleting the holes in the case and then re-creating them with a boolean subtraction from the protruding part.