To limit the probability that a closure will be constructed of a material that would not adequately control the spread of fire by means of radiation through exterior openings, which could lead to the spread of fire from the building to an adjacent building during the time required for emergency responders to perform their duties, which could lead to damage to adjacent buildings.
To limit the application of Sentence 3.2.3.5.(1) and prohibit the use of wired glass or glass block as closures in openings in certain walls.