Do interior doors have a dedicated built in door closer?

That thing is really good, the anti-theft effect is very good, and you can't get out without a cipher.

Very rarely, the current security door is generally not equipped with a door closer.

Fire protection design code, if there are upper and lower floors connected to the corridor, escalators and other openings in the building, the upper and lower connecting floors should be used as a fire partition, and the sum of its construction area should not exceed the provisions of Article 1 of this code. Note: In the atrium of a multi-storey building, when the opening part of the room, the corridor and the atrium communicates, there is a Class B fire door or fire shutter that can be automatically closed; 

No, you cannot. One will cause inconvenience.

Affect normal use. >>>More

What does it mean to ask? Where are interior doors dangerous? >>>More