Fitness pull-ups, please install. Is it harmful to the door frame or wall? How much can you bear?
First, look at what kind of wall your wall is. Some non-bearing walls are made of hollow bricks. That can't be pulled up. One is unstable, and the other is that it will crack in a short time. You can hear it when you knock on the door. The sound is loud and empty, which is obviously different from the sound of a solid wall. If it is a solid wall, it actually does little harm to the wall. As long as it is fixed, both ends will not rub against the wall when doing it.