To supersede the requirements of Sentence 9.10.14.4.(1), which would otherwise require certain maximum areas of unprotected openings, and permit a doubling of unprotected openings if certain conditions are met [i.e. the unprotected openings are glazed with wired glass in steel frames or glass blocks as described in Articles 9.10.13.5. and 9.10.13.7.].
This is to limit the probability that fire will spread from the subject building to an adjacent building through unprotected openings during the time required for emergency responders to perform their duties, which could lead to damage to the adjacent building.
To expand the application of Article 9.10.13.5. and 9.10.13.7. to wired glass and glass block in exposing building faces.