it's just a set of func_doors that start closed and open through the OnSetupFinished output. If you want the specific orange setup doors seen in maps, it's several door_grate related props.
The door itself is made up of two func_doors, a lower and an upper one, that each has one of the door_grate sides parented to it. The doors are set to 'don't render' so that they won't appear ingame. If you're stuck with making it, then you can always open up a decompiled valve VMF to see the logic and prop setup used for them