What is the best groove for slotted doors?

36cm. According to the architectural practice, the entrance door wall of a self-built house is recessed into a brick and a half, which is 36 cm, which is better, with a suitable angle of view and beautiful appearance. Convenient for later installation of screen doors and curtains. The slot door is the middle part of the external wall of the building facade that retreats 1 to 3 meters, forming a recessed space, focusing on decorating the recessed part in the middle.