Snakes have very low oxygen requirments, which is why you cannot euthanize them with CO2 (it takes too long and is ineffective).
I let them come out of the egg, then move them into a container with moistened paper towels and a small water dish. I keep 4 per container and keep them in the incubator till they shed, then move them into their own tubs in the rack.
I had a 5 egg clutch emerge from the eggs this weekend while I was out of town for just over two days. When I came back they were fine, and my tubs are not ventilated.
Bruce