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How big of a hole is it?
You might just be able to run heater vent tubing right through it.
You might just be able to run heater vent tubing right through it.
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looks like you have a vent!It's the size of the large coffee cans, cause that's what used to be in there to create the holes. Lol
looks like you have a vent!
yes, on the inside of the room you can use a bathroom vent cover to conceal the opening and give it clean look.Ok so what would you do? Use the basement fan you posted earlier. Hook up a heat vent to it and go through that hole to pull air outside?
No I have never seen or noticed any rust on it.Awesome. I assume I won't have any issues with that unit rusting

Not sure if it's okay to do or not, but what about running a dehumidifier in the bunker room and have it drain into a storage container and if the water was pure enough could it be used as a top off for the tank? Or if not then to a drain or manually draining the container.
Thanks for the info about that! Since I live in the desert southwest of the US, I have never had to use a dehumidifier before so never knew how they worked exactly. Also didn't think about the metals used and how it could harm the inhabitants! Would of hated learning that the hard way!...it's a double edge sword, most if not all dehumidifier use a fan in the unit to pull in air from the surrounding area, which typically has high moisture levels. When air passes through the dehumidifier, it touches the cooling coils (basically an AC unit, and why you see a window unit dripping water outside), which in turn pull moisture from the air by lowering the temperature. That creates heat by the dehumidifier warming the room and allowing more moisture to condense and removed, place this into an enclosed environment like in the OP's case and you can see that it will and can raise the air temp, amount of top-off needed and would not be the best methodology.
with regards to using the water as top-off you need to be externally careful as the internal coil is metal, while I don't think most use copper anymore some older units do and copper can be deadly to some reef inhabitants

