This report describes studies on natural air motion induced in wide-span educational buildings. It includes a discussion on the influence of air motion indoors on various factors such as the span of buildings, orientation in relation to outdoor wind, open spaces such as courtyards, plan form, semi-partitions, external projections, adjacent buildings of different heights, and landscape elements. A brief description is given of the low-speed wind tunnel and the experimental procedure adopted for this study. The contribution of thermal forces was assessed by an analytical method using experimental data comprising the measurements taken in prototype buildings in the warm, humid season. The report gives design guidelines for inducing air motion and provides diagramatic representations of buildings in relation to air flow patterns. (Author)