Ok. Some starter photos. The front wall and then the back... We are not here to critique my photography skills and the colors are off, but... Anyway, the equipment is in the left of the picture (rear right if sitting in the seats)...
Another shot of the back wall.
The whole room is about 14 feet wide, 24 feet deep, and just under 8 feet tall.
So behind the front wall (which is behind the false wall) is a concrete wall. The far (right when sitting down) wall is also concrete behind the drywall/studs. The left wall near the front is shared with a wet bar on the other side. The rest of the left wall is a hallway. The other side of the rear wall is the family room.
The equipment rack area shown on the back wall (with the bundles of wires) extends out into the family room about 20" and is just short of 2 feet wide.
Just on the other side of the equipment rack, where it extends into the family room, is a 6 foot sliding door that goes outside.
The two "feed" HVAC in the room are pretty much in the middle on each side and in the soffits. (Just a few feet in front of the wall sconces.)
I will keep looking for a diagram, but this is what I could dig up quickly.
Also of note, there are no, zero, zip, nada air returns in the basement. My research has also shown that putting them in basements seems to be a mixed bag depending on which HVAC company you talk to. Some say that they help, others say that they don't and can actually decrease performance or efficiency (which are two different things). I had more people say to leave them out because our furnace is NOT high efficiency meaning that it needs to suck air in from outside to work and if there are returns in the system that it can start putting exhaust gases into the house. What do I know, they are supposed to be the experts, and I couldn't get any HVAC person locally to recommend it either...
EDIT: I couldn't find a diagram of the layout, so I (poorly) sketched one up. I know, I have the hand writing of a doctor. I work in I.T. I type everything...)Edited by nickbuol - 9/24/12 at 6:35pm