Ventilation to Reduce the Spread of Respiratory Infections by the UK Health Security Agency (source code)

= Ventilation to Reduce the Spread of Respiratory Infections by the UK Health Security Agency
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https://www.gov.uk/guidance/ventilation-to-reduce-the-spread-of-respiratory-infections-including-covid-19

“Natural ventilation in the home” explains that top window openings allow incoming fresh air to mix and warm, reducing cold draughts. This present-day guidance supports the physical mixing explanation; it is not cited as an 1866 publication.