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A rotating door is a door that rotates instead of sliding. Imagine the draw bridge of a castle, and you imagine a rotating door. Or imagine the door of a fridge, and you also imagine the rotating door.
To make a rotating door in NetRadiant, one needs to define where the rotation axis is. This is done in the entity inspector by not selecting an x,y,z option (to have the default axis) or by selecting one of the given x,y,z options. That defines the axis. But you also have to define one point that lies on that axis.
To define a point on the selected axis, you need to create an origin brush. That's just a normal box brush with the "origin" texture. This brush must be a part of the rotating door entity, so it's best to first create the door brushes and the origin brush, and then to select them all and turn them into the rotating door entity.
The rotation angle also needs to be defined. Speed, damage and so forth - just as one knows it from the normal door.