If you just want to go straight to the animal in the video, cue up to 4:27!
Paul, what I would suggest for the chargers is to hook up a small AC fan (brushless, no sparks!) in your charger box. Just cut a hole in each side of your plywood box, making sure one of them is the same size as the fan. Install the fan in the box with a couple of screws. Plug the fan into the same power strip as the chargers, so that when you plug the car in, the chargers and the fan goes on.
Unless you have TOTALLY sealed batteries, batteries will create hydrogen gas which you will want vented out of there with a fan.
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