What is another name for natural ventilation that refers to its mechanism?

Natural ventilation is commonly referred to as natural draft, which accurately describes the mechanism by which air moves through an environment without the assistance of mechanical fans or machines. In the context of mine ventilation, natural draft occurs due to differences in temperature and pressure. Warmer air, which is lighter, rises, creating a flow that draws cooler, denser air into the space. This natural circulation is critical for diluting harmful gases and ensuring adequate oxygen levels in underground environments.

The term "natural draft" encapsulates this passive mechanism of airflow, emphasizing its reliance on natural forces rather than artificial means, such as fans or blowers used in mechanical ventilation systems. Understanding natural draft is essential for effective mine ventilation design, as it helps in planning for airflow patterns necessary for maintaining safety and health standards within the mine.