Purge ventilation
Approved Document O: Overheating, published by HM Government in 2021, defines purge ventilation as: ‘Ventilation of rooms or spaces at a relatively high rate to rapidly dilute pollutants and/or disperse water vapour.’
Part O 2021 (England), Technical Guidance, July 2022 – Final Draft, published on the Future Homes Hub, defines Purge Ventilation as: ‘usually defined as ventilation provision intended for the rapid dilution of indoor pollutants such as burnt toast or a steamy shower. Part F states requirements for purge ventilation. Higher ventilation rates may be required to meet overheating mitigation under Part O.’
Approved Document F Volume 1, 2021 edition, defines purge ventilation as: ‘Manually controlled ventilation of rooms or spaces at a relatively high rate to rapidly dilute pollutants and/or disperse water vapour. Purge ventilation may be provided by natural means (e.g. an openable window) or mechanical means (e.g. a fan).’
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