To limit the probability that fire will not be detected in the elevator hoistways and dumbwaiter shafts, which could lead to persons not being promptly notified of a fire situation, which could lead to delays in evacuation or moving to a safe place, which could lead to harm to persons.
To clarify the requirements of Sentence 3.2.4.11.(2), in regards to the detection of fire in the elevator hoistways and dumbwaiter shafts where a sprinkler system is not installed within the hoistway or shaft.