If after an occupant has exited the building and walked down a fire escape and is on the ground, does this passage apply to materials within a certain distance of their passage away from the building? If so, how far away from the building do they need to be before this provision no longer applies? Are LP tanks considered a combustible material? Surely the fuel is that is inside, but the tank itself is not combustible. If an LP tank is considered a combustible material, can a steel enclosure be built to protect passers-by?