The paper focuses on the natural ventilation research of space through windows. The various ventilation strategies were examined in relation to the number of open windows and ventilation geometry ergo air flow distribution. The numbers of chosen air flow distributions in space are 2. The first air distribution flow presents a simple ventilation distribution with one open window and the second is cross ventilation by 2 windows on opposite sides of the building envelope.
Currently in the building industry is trend to build buildings consuming little energy. For the aim reducing heat loss buildings they are building insulated and also air tightness of buildings increases.. By improving the air tightness of buildings, there is a change of indoor air quality in buildings. Without natural or mechanical of ventilation there is a significant deterioration of indoor air quality. For the raising of quality indoor air is optimal system with demand-controlled ventilation using sensing of carbon dioxide.