Hi there.
So, I managed to explore the vents today during a round as a dionae. Sent a nymph through and explored, and I found a huge issue on it. All of the vents per area are controlled by pressure regulators.
This one controls all of medical. Upper level, main level and lower level all come through that one vent.
This one here is one of the main service ones.
Now, aside from the fact that if someone knew what they were doing, they could seriously mess with atmospherics and/or the connected departments like this, it raises a huge issue for creatures that use the vents.
Borers, Greimorian Larva, Changeling Crawling Form, and Nymphs, (maybe others as well) all of these cannot easily get between department to department, which is kind of needed for a lot of the gameplay they bring to the round.