To limit the probability that mechanical components of doors [e.g. closures] will be damaged, which could lead to their improper operation in a fire situation, which could lead to the spread of fire from one side of a fire separation to the other side of the separation, which could lead to harm to persons on the other side of the separation.
To limit the probability that protective guarding devices will interfere with the proper operation of doors in a fire situation, which could lead to the spread of fire from one side of a fire separation to the other side of the separation, which could lead to harm to persons on the other side of the separation.