There are many steps in making the circuit board.
If you're talking about the circuit design that you do on the monitor; that is done on the monitor right of the microscope that is under the cabinet where you got the silicon wafers.
There is I believe a cat leg beside the microscope.
This microscope is ahead when you enter the photo room.
The one on the right side of the room is not the microscope and monitor you need to use - that is for the end process.
Good that you figured it out.
As for the air vent - there are 2 solutions in the walkthrough- Amateur and Master - use the one you are doing.
Generally, when it says F - that is one click forward (not til the end of the path).