During the size-up at a reported fire at Harmony Plaza, a multistory commercial building, firefighters observed several key elements around the property. The exterior showed signs of damage from previous small fires, and there were multiple access points for fire trucks. However, during their inspection, firefighters noticed that some smoke detector covers appeared to have been removed from the ceiling. During the 360-degree size-up at Harmony Plaza, firefighters must be vigilant for which of the following?
