What does "plenum" refer to in this context?

In this context, "plenum" refers to a type of air distribution space used in heating, ventilation, and air conditioning (HVAC) systems. The term is connected to the function and safety of systems designed to operate in specific environments, particularly concerning fire safety.

Option B, identified as FFLP (2 FFS), likely pertains to "Fire Rated Flexible Non-Metallic Plenum Cable," which is important in plenum spaces. It is designed to minimize the risk of fire and smoke spread, making it suitable for installation in areas where airflow is managed to maintain indoor air quality and temperature control.

Using appropriate materials in plenum spaces is crucial as these areas can facilitate the movement of air from one space to another, and improper materials can pose significant fire hazards. Thus, understanding the role and characteristics of cables utilized in plenum applications is vital for safety and compliance in building codes.