What is indicated by an incomplete seal of a smoke ejector during a fire?

An incomplete seal of a smoke ejector during a fire indicates recirculation. This occurs when the smoke ejector is not creating a complete barrier, meaning that while it might be expelling smoke from the structure, it also allows for some of the expelled smoke to be drawn back into the area. This can happen when there are gaps or leaks around the smoke ejector that fail to adequately prevent the backflow of air and smoke.

Recirculation can lead to reduced efficiency of smoke removal operations, endangering the occupants and firefighters, as it can create a hazardous environment with smoke potentially returning into the space that is being ventilated. The presence of recirculation can indicate a need to reassess the sealing and positioning of the smoke ejector to ensure it functions effectively.

In contrast, secondary convection relates to the movement of air caused by temperature differences, paradoxical ventilation refers to unintended airflow patterns that may occur under certain conditions, and churning denotes chaotic air movement that can hinder effective ventilation. Understanding the implications of incomplete seals enhances safety protocols and operational effectiveness during firefighting.