Under the dual pressure of saving energy and keeping good indoor air quality, scientist all over the world, especially European scientist, start to survey the naturalventilation technique over again.
The noticeable problems that should be noticed appear in reforming the ventilation systems of gold mines, in which the natural wind pressure is higher, are discussed in this paper.
Naturalventilation in heated pressure occupies a more and more important position in the building ventilation design because of being free from outside factor influence.