For some time it has bothered me that the bathroom will be cut off from the A/C or heat when the door is closed which will be the case most of the time. So I figured I would go ahead and attach a custom vent that will run from the A/C unit to the bathroom.
So this is what I did. I had some plastic pipe and a vent sitting around:
I took down the interior A/C cover and cut a hole in the side:
Then I cut a hole in the metal on the A/C bracket and a hole in the bathroom wall and ran the pipe through:
Next I mounted the vent in the bathroom:
I tested it and it seems to work well. Just a small amount of air comes through. Just enough for the small size of the bathroom!