Folding doors can be constructed from 2nd, 3rd, and 4th floors to higher floors, not just from 1st floor. Construction is easily accomplished by using sky equipment. It is a restaurant where many customers visit and enjoy delicious meals, so it always smells like food. However, if the food smells too bad, it can convey inconvenience to customers rather than irritating their taste buds.

It is necessary to ventilate frequently so that the smell of food does not stick indoors, but it is difficult to air circulation wide restaurants quickly with small windows. In addition, if it is closed for a long time after the business is closed, it is located on the second floor because the air inside remains murky in an enclosed space, and the existing windows are not large, making it difficult to ventilate. The window-type folding door provides fast air circulation, so you can maintain a pleasant interior.

When constructing with an external window folding door, the lower rail is designed and manufactured differently from the normal folding door. On rainy days, the outside and inside of the lower rail are different to prevent rain from entering the room. The exterior window-type lower rail prevents rain from entering the room, but the interior-type folding door is made of internal containment-type lower rail, such as a regular folding door, because it is not related to rain.