EN
The article presents investigation results of the influence of two different systems of mechanical ventilation use (positive and negative pressure) on the distribution of temperatures in typical, for Poland, pig breeding buildigs of untight structure. As the examinations proved, more favourable temperature distribution both in the ared where animals are kept and at the whole space of the building was obtained for negative pressure ventilation. Not expensive channels which secure dispersed inlet of fresh air in to the building with the speed which in winter does not exceed 0,01 - 0,02 m/s proved to be good.