What does LFL stand for in fire safety terminology?

The term LFL stands for Lower Flammable Limit, which refers to the lowest concentration of vapor in air that can ignite when an ignition source is present. In fire safety, understanding the LFL is crucial because it helps determine the safe handling and storage conditions for flammable substances. When the concentration of a flammable gas or vapor falls below this limit, it will not propagate a flame; therefore, knowing the LFL allows for better risk assessment and safety planning in environments where flammable materials are present. This understanding is essential for preventing fire hazards, as it informs safety protocols like ventilation requirements and monitoring of hazardous areas.