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What (who) is secondary ventilation - definition
![[[Dogtrot house]]s are designed to maximise natural ventilation.](https://commons.wikimedia.org/wiki/Special:FilePath/John Looney House.jpg?width=200 "[[Dogtrot house]]s are designed to maximise natural ventilation.")
![cross-draft from atrium to garden]].<!-- A cistern below the impluvium stores rainwater for refilling the impluvium during dry spells.-->](https://commons.wikimedia.org/wiki/Special:FilePath/Domusitalica.svg?width=200 "cross-draft from atrium to garden]].<!-- A cistern below the impluvium stores rainwater for refilling the impluvium during dry spells.-->")
Wikipedia
Passive ventilation is the process of supplying air to and removing air from an indoor space without using mechanical systems. It refers to the flow of external air to an indoor space as a result of pressure differences arising from natural forces.
There are two types of natural ventilation occurring in buildings: wind driven ventilation and buoyancy-driven ventilation. Wind driven ventilation arises from the different pressures created by wind around a building or structure, and openings being formed on the perimeter which then permit flow through the building. Buoyancy-driven ventilation occurs as a result of the directional buoyancy force that results from temperature differences between the interior and exterior.
Since the internal heat gains which create temperature differences between the interior and exterior are created by natural processes, including the heat from people, and wind effects are variable, naturally ventilated buildings are sometimes called "breathing buildings".
