The Swedish building regulations give recommended tightness values for buildings of 3 air changes per hour for single houses, 2 air changes per hour for other housing with not more than two stories and 1 air change per hour fortaller buildings.
Tightness and its testing in single and terraced houses Tathetsprovning av smahus och radhus.
![](https://www.aivc.org/sites/default/files/default_images/default_image_5.png)
Year:
1979
Bibliographic info:
Tyrens technical memorandum 1979:5< = Byggmasteren no.5 1979