To supersede the requirements of Sentence 3.2.3.17.(1), which would otherwise require a canopy, if certain conditions are met [the building is sprinklered throughout]. This [the sprinklering] is to limit the probability of the spread of fire from one storey to the storey above through openings in the exterior wall 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 storey above.