Okay, I know the shower liner stuff you are talking about. What does that sell for nowadays?



Low vents in a tall cage allow for heavier-than-air gasses to escape, which can especially be a problem in taller cages for snakes like burmese pythons.



Heat escape is an issue, no doubt, but remember you are heating this cage with a radiant heat source so you won't see the same degree of convective currents that we normally think of with homes.



Besides, with the way you insulated this cage you'll probably find yourself wanting a bit of heat loss just to have a proper thermal gradiant. My bearded dragon cage had a huge amount of ventilation with its false ceiling and even in the winter I had trouble keeping the cool end cool enough.
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Current snakes:



0.0.1 Gonyosoma oxycephala - Java locale (green)



1.2 Gonyosoma oxycephala - Jave local (green)



2.2 Gonyosoma janseni - Seleyar locale (all black)



1.2 Gonyosoma janseni - Celebes locale (Black & Tan)

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