Bifold doors are supported primarily by a track system installed at the top of the door frame. The weight is distributed along the track, which allows the doors to operate smoothly. Some systems also have a guide track at the bottom to stabilise the doors further.

Bifold doors are supported primarily by a track system installed at the top of the door frame. The weight is distributed along the track, which allows the doors to operate smoothly. Some systems also have a guide track at the bottom to stabilise the doors further.