What does natural ventilation depend on to allow air to flow out of a structure?

Natural ventilation relies on convection currents and wind to facilitate air movement out of a structure. Convection currents occur as warm air rises and creates a pressure difference that allows cooler air to enter from outside, leading to the exchange of air inside the building. Wind also plays a crucial role by exerting pressure on the building, which helps push stale air out and draw fresh air in through openings, such as windows, doors, or vents.

This method of ventilation is advantageous because it doesn't require mechanical systems like fans or blowers, making it a more energy-efficient way to maintain indoor air quality. It utilizes the natural forces present in the environment to achieve air circulation, thereby enhancing the comfort and safety of occupants while reducing energy consumption.