The veranda folding door optimized for free use of space!
I'm done with the veranda expansion and non-expansion worries!
It is possible to use space for expansion and non-expansion with folding doors.

The apartment-type folding door is a folding door used for residential spaces, not for wearing shoes, and if the lower rail is high, it may hit its toe and seriously injure it when passing, so construction is carried out with a frame of the folding door suitable for the construction site.

Construction with a frame that doesn't fit the location can cause discomfort, but the as incidence can also increase.The minimum slim lower rail 23 mm minimizes the height protruding above the bottom surface and exposes it to about 15 cm.​

The minimum exposed lower rail significantly reduced the discomfort of foot traffic.