Which type of ventilation relies on the natural buoyancy of warm air to enhance airflow?

The type of ventilation that relies on the natural buoyancy of warm air to enhance airflow is passive ventilation. This system operates on the principle that warm air rises, creating a natural airflow as cooler air is drawn in from below to replace it. Because warm air is less dense, it will naturally rise and escape through vents or openings at higher points in the structure, while cooler air enters from lower points. This process helps to maintain a balanced and healthy environment in the attic without the need for mechanical systems.

Passive ventilation is particularly effective in climates where natural air movement is sufficient to control temperature and humidity levels. It is a cost-effective and energy-efficient method to promote air exchange, reduce moisture buildup, and lower the risk of condensation in the attic space. Understanding this concept is crucial for inspectors, as it helps identify whether a ventilation system is functioning properly and providing the necessary airflow for the building.