The residential area is typically constructed with a main gate that distributes living room and veranda space.​

Many people worry about expansion when it comes to veranda. If you expand, you can use the living room more widely, so many people choose to expand it, but as all the pros and cons are, the space becomes larger, but it is far from enough to prevent the cold winter day temperature with one window.

So there are many people who regret it after expanding it. Folders with more than 90% of the opening and closing rate can all be folded and expanded.

You can also use the space on the veranda by opening all the folding doors and separating the space.​
Open and close when necessary to increase space utilization, and fold the folding door to double block the temperature outside of winter, which was not prevented during expansion, to maintain the room temperature.​

Rubber gaskets are used between doors to block outside temperatures, noise, and wind lamps, and mohair is mounted on the lower rail to create more insulation, sound insulation and windproof effects.