Is this sufficient for a 30" x 12" x 15" vivarium?

Used the universal teaspoon for perspective.

For those who are Lilliputians or Brobdingangs, it's 15cm x 7cm. The holes are roughly 1cm in diameter, and there are 24 of them.

if you have two or three of them then yes.

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I take it you only have one set of them? I would put one either end of the viv at least.

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Okay, I'll do one at the other end - should it be at the top or bottom though, taking into consideration the current vent is at the top.

I'm assuming the bottom to allow for circulation, especially with the heat from the mat rising.

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