The safety door must be opened outside.
From the perspective of geomantic omen, the security door is a setting to resist external evils and must be opened to the outside world.
Does not occupy indoor space.
Opening the door outside will not occupy indoor space, and people are more accustomed to using it, which is particularly important in the sense of fire protection, because it will be more convenient to escape if there is an accident inside the house.
Opening inward is not easy.
When hit by a foreign object, the outer door is not easy to open inward.
The door lock is safe.
The door lock is safe and the card can't be opened from the outside.
Will not conflict with each other.
When guests visit, if they open the door at will, they will conflict with each other.
Will not affect the neighbors' travel.
It's safer to open the door and control the other party's line of sight. It is easy to defend with your feet under uncertain circumstances, and it will not affect neighbors' travel and occupy public areas.
This lock is unsafe.
The internal door lock is unsafe and easy to be stuck. So remember to lock the door when you go out
It's inconvenient to escape.
When you run away, it is not convenient to open the door outside. In an emergency, people are blocked at the door, which is not conducive to opening the door to escape.