1, do not occupy the aisle: when the entrance door opens inward, it will not occupy the aisle space, especially for compact units such as one staircase with three households and one staircase with four households, so as to avoid the collision between doors.
2. Avoid collision: When the door opens inward, it will not affect others. For example, having children at home can reduce the friction between neighbors because of opening the door hard.
3. Good moral: In Feng Shui, the inward opening of the entrance door is considered to bring wealth and good luck to the family, which indicates that the financial resources are rolling.