It was manufactured as a black-colored folding door to suit the characteristics of the car center, which has a lot of oil and various contaminants, and to provide a wider opening and closing feeling, it was constructed in an unilateral manner that opens and from each frame. It is a car center where large vehicles need to enter and exit, and for that reason, if only open entrances are left at all times, loud noise will spread not only inside but also outside the sound of each work, delivering damage to nearby residents.​

However, it can be easily opened and closed left and right at any time, blocking the sound of the workshop inside the car center with folding doors, reducing damage caused by noise, and blocking external weather and dust during work to block obstacles during detailed work.​

The high airtightness and airtightness of the folding door can provide soundproofing effects on the inside and outside.