For those who have space problems and for those who live in small spaces, a viable alternative to the sliding doors are the doors with folding opening system I fold. This opening system available for many models of doors. Piego provides that the door leaf is divided in half, centrally and symmetrically, so as not to clutter once opened. The door does not go to occupy space within the premises but steals a part of the passage width. The opening system like a book I fold reliable and guaranteed thanks to the numerous test that are made before release.