What device consists of double doors for controlling airflow in passageways?

The correct answer is the air lock, which is specifically designed to control airflow in passageways, especially in environments where maintaining distinct air conditions is critical. An air lock functions by utilizing a set of double doors that create a barrier between two areas, such as a mine entry and the outside or between different sections of the mine. When one door is opened, the other door remains closed, preventing the immediate exchange of air and helping to regulate pressure differences and minimize potential contamination or the influx of harmful gases.

In mining, where ventilation is vital for worker safety and operational efficiency, air locks contribute significantly by providing a controlled environment. This helps to maintain a steady airflow, ensuring that fresh air enters while exhausted air is effectively channeled out of the working areas. Overall, the air lock is an essential component of a well-managed mine ventilation system, aiding in the safety and health of miners.