Ships are divided up by air-conditioning boundaries, which in civilian life, are often called "heating zones." Each area had its own fanroom that supplied either cooled or heated air, depending on the season. The zones were divided by interior bulkheads and there were doorways with joiner doors on pneumatic closures to permit passage between the zones.
XOs were often pinging on the department heads to keep the joiner doors in their spaces in good working order. If the passageway on one side of the door was maintained by a different division than the passageway on the other side of the door, the door belonged to whichever division maintained the space into with the door opened.
Some of those joiner doors took a hell of a beating. The pneumatic door closers in the Navy supply system didn't seem to be up to the job. The closers got pulled off and fixed or replaced and then mounted back so many times that the base metal under them gave out from the strain.
If you wanted to see real hell on earth, try running a set of gas-welding lines through an a/c boundary when it was hot or cold out, especially if that open door was at the edge of Officer Country. The XO would want to know why those lazy-ass HTs couldn't be bothered to move the gas bottles closer to where they were working (or use a portable rig). When there was serious repair work going on where the doors had to be rigged open, if not removed, XOs often went into max-fret mode.
And if you wanted to see real fireworks, watch what happened when an XO began harping about air-conditioning boundaries on a Chief Engineer who was dealing with a boiler casualty or who had an OPPE coming up in three weeks.
Still, if you wanted to keep the ship either heated or cooled, air-conditioning boundaries had to be respected.
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