JimS said:If you make a hole in the wall for a fan it would be easy to slip some short 2 x 4s in to line the "duct". A few dry wall screws to hold them could be covered by the grills. Would make it much more solid to mount the fan also. I have also wondered about the heat. I am putting my things in a large cabinet. Nothing with a lot of power - a few routers and Pi boards, a ups...Passive ventilation will probably be adequate if I make the openings fairly large for a little more flow.
Yeah, maybe. I'm struggling a bit with the new house as it has all metal studs. While it is nice to think there are no termites, they are problematic when it comes time to do... well, most anything. They are REALLY flimsy and rely on the sheet rock to tie together for strength. Adding a horizontal 2x4 I have not done, but I think I would have to open up the opposite side of each stud to screen them in from the back side of the metal stud. I hung a TV, and I took out a large section of sheet rock and put in ply wood instead, screwed it into the studs and then screwed the TV to the ply wood.
So framing up inside the wall is all new to me. I really rather miss wood studs.