Prospects of reactivating historical stack ventilation systems in schools – a measurement analysis.

Runa Tabea Hellwig, Christian Tanzer, Michael Sedlmeier

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review


Stack ventilation systems were installed in German schools constructed around 1900 but are no longer in operation. The aim of this study was to show how reactivating these systems could improve the IAQ in classrooms. Old stack ventilation systems were put into operation again in three classrooms in a school. A fourth with window ventilation served as a reference case. All classrooms were measured for CO2 levels, air temperature and relative humidity. During the winter, 50% of all measured CO2 values for window ventilation were higher than 1800 ppm. Rooms with stack ventilation showed median values of 1600 and 1350 ppm respectively. In the classrooms with stack ventilation, the air volume flow per person was ap-proximately seven times higher as with window ventilation. The revitalisation of stack ventilation provides the potential to improve the IAQ. Automated flaps to close the shafts at night and during flow reversal in summer could allow the systems to meet today’s energetic and hygienic requirements.
Original languageEnglish
Title of host publicationProceedings 13th International Conference on Indoor Air Quality and Climate: Indoor Air 2014, Hong Kong, 7-12 July 2014
Number of pages8
Place of PublicationHong King
PublisherInternational Society of Indoor Air Quality and Climate
Publication date2014
Article numberH0629
Publication statusPublished - 2014
Externally publishedYes


  • school building
  • indoor air quality
  • stack ventilation


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