Don't know why the pics didn't open for you... Anyways, those sketches didn't work, but on a 3rd try, I built a good light trap for my intake, which added 2˚F to the cabinet. If you are interested in doing a light trap, let me know. Although the one gumball linked to looks very nice and is really slim, I have doubts about the airflow. I think you're worse off with "vent" style light traps, because (IMO) they break up the airflow more, and decrease speed. I did an S-shaped box which requires three 90˚ turns, and keeps the air together. Before, I had a regular (non-light blocking) vent, which added 3˚.