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Because the piping room stairs keycard is after those two doors.
You need to use the vent system in order to get there.
This area is needed for Justins microwave mission / Marks server quest.
Only do the one you're supposed to do when you have that quest active.!!
you need to enter the vent at the small closet on the ground floor which has a mop & bucket at the RHS of the door..
Top LHS of that room is the entry vent.
It's an almost impossible crouch jump within the vent which had me scratching my head.
it's also met as you go straight on inside that vent to get to that jump junction.