A fair comparison of ventilation systems is almost an impossible achievement. Even an economic comparison causes difficulties; the different systems render different room air qualities which cannot be counted in money.
Mechanical ventilation or natural draft. Painovoimainen vai koneellinen ilmanvaihto.
![](https://www.aivc.org/sites/default/files/default_images/default_image_5.png)
Year:
1981
Bibliographic info:
LVI 1981 no.1 p.42-45