Bifold doors, also known as folding or concertina doors, are folded in sections or panels, usually in two sections (although some with more sections are still called bi-folds). One of their other names is the concertina door because it resembles the instrument. İstanbul bölgesinde bakım veren tecrübeli personelimiz sizlere en https://bayrakdoor.com/villa-celik-kapi-modelleri