To exempt openings in certain rated fire separations from the application of Sentence 3.2.1.2.(1), which would otherwise require rated closures, if certain measures are taken.
These measures are to limit the probability of the spread of fire from the garage to the upper portions of the building during the time required to achieve occupant safety and for emergency responders to perform their duties, which could lead to harm to persons in the upper portions of the building, including emergency responders.