another idea
i got another idea looking through your photos. if you want to plumb through the wall, cut a hole in the gyproc to the size of one of those air return vents.
Then drill the holes (you are gonna have to use some DEEP hole saws) through the 2x4's or 2x6's inside the the wall. just make sure there are no electrical lines running along the bottom of the studs.
when you dismantle, just put the return air vent on the wall and it will just look like another vent.
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If people don't die, it wouldn't make living important.
And why do we fall? So we can learn to pick ourselves up.
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