As far ahead as he can see - about 20 of a hundred or so yards from them to their goal - it's straight, with occasional intersecting passages. Ducking down to look at the vent placement on the ceiling, it seems most likely that the HVAC is placed in a grid pattern across the ceiling. Assuming everything is in good order and properly maintained (it is Jorgmund), he should be able to follow whatever path South needs to take while keeping her within a ten foot radius.

Which is good, because here comes an employee, rubbing at tired eyes, heading for the coffee station right below him.