I've seen a few somewhat like this too. The one thing I've wondered about is, the TEMP inside of the box.
I understand that the idea is to flow air through the length of the vent hose, but miners do emit a radiant
heat. With the vent connected and sealed to the miner, how do you evacuate the radiant heat??? And, I
personally am using Rockwall to deaden noise rather than plywood. If you could take some inside temps
that would be great. Thanx!!!