A total of 12 pieces of 6 pieces plus 6 pieces of thermal insulation folding door were constructed.
The lower rail is of aluminium (AL-6N01) high alloy material and is designed with a low incision and wear rate.
The lower runners are opening and closing more smoothly.​

It also has 90% of the doors open, allowing direct interior exposure.
It can catch the eyes of passers-by.

On warm days the folding door can be folded to make use of the exterior as a terrace.