The existing "Code for Residential Design" and "Code for Fire Protection Design of Civil Buildings" do not clearly specify the opening mode of the entrance door. The fire code mainly makes a rigid specification for the opening of escape doors in public areas such as corridors in the direction of evacuation.
In ancient China, house doors and bedroom doors were basically opened indoors. There is a related saying in Feng Shui that opening inward is "gathering wealth" and opening outward is "dispersing wealth".