Most modern condominiums have this type of door installed because it helps save space in the hallways. Because of its retractable nature, its also wide upon entry. Therefore, it simplifies the process of moving in and out of an apartment when needed. Mattresses, bed frames, tables they can all fit in the elevator. On top of that, you can fit a whole family in there with the furniture as well.
Packaging varies depending on the project and product.(boxed)