This orientation is based on the direction of the door. That is: Sitting west to east means that the house is located in the west and the door faces the east. Sitting south to north means that the house is located in the south and the door faces north.
In ancient Feng Shui, Dui Zhai refers to a house facing west to east. According to Feng Shui, homes are divided into four houses in the east and four houses in the west. Dui Zhai belongs to the four west houses. In addition, there are Qian Zhai (running from northwest to southeast), Gen Zhai (running from northeast to southwest) and Kun Zhai (running from southwest to northeast).