naturaldraft
Naturaldraft refers to the movement of air that is driven by buoyancy rather than mechanical fans or pumps. It occurs in vertical or near-vertical passages such as chimneys, flues, and ventilation shafts, as well as in some cooling towers and tall structures designed to exploit buoyancy-driven flow. The term is often used in engineering, building science, and industrial contexts to describe systems that rely on natural processes to move air.
The underlying mechanism is the stack effect: warm air inside a vertical duct is less dense than
Applications include chimneys and flue systems in buildings and industry, where natural draft can vent combustion
Advantages of naturaldraft include reduced energy use and fewer moving parts, while limitations involve dependence on