[S1m0n1]

Hi, I am trying to model a 3-D room with various inlets and outlets. In the end, I would like to be able to see the pathlines of the flow, along with the flow of different types and sizes of particles I inject. Right now I am having trouble completing the 3-D geometry with the inlets/outlets.

So far, I have done the easy part in completing the solid rectangle. Now to add the inlets/outlets is where I'm stuck. All I did was draw a rectangle on 2 different surfaces and I created a surface from the sketch. Is this how I would go about doing this? When I tried to mesh it I couldn't get the mesh to work. I want to have at least one inlet/outlet on each wall and the ceiling.

All help is greatly appreciated. Thanks in advanced!