These two walls... I'm pretty sure some of the hot air will run circles which in turn is like creating pressure against the exhaust of the miners.
Unless your inner wall had no vents and only fans...
That set up is for the exhaust side , ok let me explain the set-up a little bit clearer.
intake :Vent--------Vent----------Vent
------- Fan -----------Fan--------
-wall-------------------------------------------wall-
-
exhaust -
-
------- vent--------vent----------vent--------- -
Vent---Fan--vent---fan---vent---fan--vent--- -
The two sides will be 100% isolated, I will be using MDF panels , and use a cnc router to make squares for the exhaust fan of the miners, so how does explain the " run circles" ? I don't get it, because if the two rooms are isolated, and the fans push the air from cold to hot side, how is it possible for the air to run circles?
How is the humidity over there?
Very low , it's located somewhere in the mountains , it's very dry there so there should be no problem as for as humidity is concerned.