The reason I want to know is that I want to convert the Magic Conduit Flange (Static) into a door to function as a portal to the outside of my dungeon. Unfortunately I don't know how to.
What I've been trying to do is creat a door and use its model, but I can't find it.

Can someone help me with this?

Extract the meshes from the Meshes.bsa
Open the Magic Conduit Flange and see what model it uses. Go to your door and pick that mesh.
If it has no collision, you can just place the static mesh inside your dungeon, and then put one of the already existing teleport doors in the same place.

Then it will seem like you moved into the portal.

What program do I use to extract the Meshes.bsa file? I tried Winrar, but it said it was an unknown format.

go to Skyrim nexus and search for "BSA"

One of those programs should do, provided you choose one of those with the most downloads.