Ventilation and indoor air quality in newly built school with hybrid ventilation

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This paper is a case study of ventilation and indoor air quality (IAQ) investigations in a Finnish comprehensive school with hybrid ventilation system and several reported IAQ problems. The functionality of hybrid ventilation system and perceived and measured IAQ in the classrooms with perceived stuffy air and bad odors were determined. Supply air distribution to classrooms was CO2 controlled. Measurements revealed that supply air flow rate was insufficient, and CO2 concentration or other IAQ measurements were unable to
detect ventilation and IAQ problems, which were caused due to improper operation and guidance system error. Pressure losses in the supply air duct system caused uneven supply air distribution to classrooms. However, results indicate that hybrid ventilation changed to mechanical supply ventilation is able to provide adequate ventilation and IAQ when designed and maintained properly.
Original languageEnglish
Title of host publicationHealthy Buildings 2017 Europe
Place of PublicationLublin, Poland
PublisherLublin University of Technology
Number of pages6
ISBN (Electronic)978-83-7947-232-1
ISBN (Print)9788379472604
Publication statusPublished - 2017
MoE publication typeA4 Conference publication
EventHealthy Buildings Europe - Lublin, Poland
Duration: 2 Jul 20175 Jul 2017


ConferenceHealthy Buildings Europe
Abbreviated titleHB
Internet address


  • Hybrid ventilation
  • school building
  • indoor air quality
  • CO2-concentration
  • pressure difference


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