What do you mean by opening the east door? Is the door facing east?

This direction is based on the direction of the gate. That is, sitting west facing east means that the house is located in the west and the gate faces east. Sitting south to north means that the house sits south and the gate faces north.

In ancient geomantic omen, "opposite house" refers to a house facing east from west. Feng Shui divides the house into Dongsi House and Xisi House. The opposite house belongs to the West Fourth Hospital. In addition, there are Ganzhai (from northwest to southeast), Genzhai (from northeast to southwest) and Zhai Kun (from southwest to northeast).