This is an Q&A / FAQ for the Mission "First City Bank and Trust" in the game "Thief II: The Metal Age" by Looking Glass Studios at Lytha.com.
First City Bank and Trust
How do I disable the alarm in the bank?
If you want to turn off the cameras in the foyer, you can do that from the security control room on the third floor. The alarm -when you set it off- should go offline after a while by itself.
How do I make the bar in front of the vault go away?
Go in the cellar, find the switch for the bar (in the NW) and turn the switch puzzle to green.
How do you get into the air conditioning shaft? I found a door to the shaft, but can't reach it.
This end of the shaft seems to be more of an exit than an entrance, a fancy shortcut from the 2nd floor NW to the 1st floor NE. So, if you should ever be stuck in the 2nd floor, NW, then take the fancy way down to the 1st floor through the air conditioning vent. This is not very probably though, IMHO
We found no real use for the shaft yet, but that depends most probably on the route that you are taking through the Bank.