The three rooms are either the same size, or the middle is big and the sides are small.
The three rooms are the same width, and the rural room in the middle is called the front of the hall, and the geomantic terminology is called Zhong Mingtang.
Small halls on both sides of the house are big, or the doors are too wide, which are all bad ways to escape. If you don't get angry at home, the hall will be small.