The spread of the fire on the outside of the building by the flame from the Windows and other openings or by radioactive heat from the fire scene to surrounding buildings
The fire on the exterior of the building by the spread of flames from the windows and other openings or by radioactive heat from the scene of the fire to neighboring buildings
The fire spread to the outside of the building by flame from the windows and other openings or by heat radiation from the scene of the fire to nearby buildings