An exposure on the left side of the fire building may be designated as exposure:

In fire protection terminology, exposures around a fire building are typically designated using a systematic naming convention to help firefighters communicate effectively during operations. When referencing the left side of a fire building, the standard designations are typically used to signify the relative positions of different exposures.

Designating the left side exposure as B or 2 follows this conventional system, which helps to establish a clear point of reference for all personnel on the scene. In the context of a fire incident, understanding the locations of exposures is critical as it informs tactics and strategy for fire suppression and protection of adjacent structures.

In many cases, the front of the building is identified as exposure A, with the sides following in alphabetical order (B for the left side, C for the rear side, and D for the right side) or numerically (1 for the front, 2 for the left, 3 for the rear, and 4 for the right). This systematic approach reduces confusion during operations, especially in high-pressure situations where quick, accurate communication is paramount.

Therefore, selecting B as the designation for the exposure on the left side of the fire building aligns perfectly with the established protocols within the NFPA standards, reinforcing clear communication and operational effectiveness among firefighting personnel.