[ccomer1955]

I have the fan about two and a half inches from the heat sink on the LM317 blowing directly on it. Putting a vent on the other side of the box wouldn't be difficult. Probably the easiest way would be to drill some holes in a pattern and stain the insides of the holes. Think I should? The box itself is inverted on its lid, and I have the lid screwed down on all four sides with the box itself about half an inch above the bottom of the lid. While that's not an actual vent, it does provide some avenue for air to be forced out of the box, but I'm sure I can figure out an aesthetically pleasing way to make vent on the other side from the fan.
Eventually, the plan is to watch this one for a while to see if the PS develops any problems, then make one like it for each of my battery radios, so I don't have to take the PS down and put it back together all the time each time I use a different 20s set. I'm sure I can find a better looking box to use than this Michael's craft box. too.