Effect of wind on stack ventilation performance

► Wind effect on the stack ventilation performance is significant. ► The research proved that ventilation rate under wind can change even up to 350%. ► Stack ventilation is capable of ensuring appropriate IAQ during winter. Stack ventilation is frequently the only ventilation system available in many educational buildings. Unfortunately, this kind of ventilation is far from being reliable. The present article deals with effects of wind on the stack ventilation performance in an average kindergarten in Białystok (Central Europe). The measurements were taken when indoor and outdoor temperatures were similar so as to minimize the differences in stack effect, i.e. reducing the influence of temperature difference on the ventilation rate. Wind has a considerable influence on the air rate in the stack ventilation system; the research proved this rate could change up to 350%.