Building Regulations in Ireland and the UK specify a minimum area for background ventilators in different rooms and minimum rates of extraction in wet rooms for the application of natural ventilation, as illustrated in the graph above. It also requires various levels of window opening for purge ventilation.

As an alternative to intermittent extract fans in wet rooms, Part F in Ireland and the UK allow for the use of Passive Stack Ventilation (PSV). PSV is a ventilation system using ducts to extract air from wet rooms to the outside by a combination of the natural stack effect and the pressure effects of wind passing over the roof of the building. The ducts connect an extract terminal in the wet rooms, typically at ceiling level, and a terminal on the roof (a slate vent or a ridge tile).

Source: Part F TGD.

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