Its not so much about the heat but rather the humidity.
A single 4" port alone may not be sufficient depending on how well the doors seal and various other factors..
Having 2 x 4" ports (I'd actually do ports for a typical 120mm computer fan) would allow you to have an inlet port to bring in fresh air via a fan blowing into the stand and then a 4" exhaust port to allow humid air to be exhausted out.
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