I just made this basic REVIT Architecture 2d Accordion / Accordian Door Curtain and thought I would share.
Below is an image of the two families that represent a 10' and 20' accordion door panel. The families are generic line based of category 'door'. Use grips to stretch the door end points. You cannot stretch them beyond their intended maximum length.
When you place one of these families in a plan view, make sure you are set to Work Plane base and not Face based. If you see the stop sign icon that means you are attempting 'face based', so you need to check your option bar.
Below are the 2 2d model families.
If there needs to be some tweeks, let me know.
* We could also turn these into 3D families using the exact same back bone but use an extruded solid instead of symbolic lines.