Re: Constructing a Euopean type Vivarium Step by Step
The point of the viv is to keep air flowing through that bottom vent and out the top one due to the heated air in the viv from the lights. Another person has put a heating cord under the vent section to further heat the air there and cause it to rise through the vent but that's not completely necessary. The air through the vent keeps the front glass clear of condensation so only mist should drip through. It probably wouldn't be much especially with the constant air flow.
-Nish
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