To limit the probability that a fire involving fuel-fired appliances outside a building will spread into the building through unprotected wall openings, which could lead to harm to persons inside the building.
To limit the probability that a fire involving fuel-fired appliances outside a building will spread to an adjacent building, which could lead to harm to persons in the adjacent building.
To make Appendix D [specifically D-2.3.14.] applicable with respect to wired glass assemblies.