What is natural ventilation?
Natural ventilation can be anything from an open window to large complex systems with double skin facades, ducts and dampers, chimneys and computer control for multiple parameters.
Natural ventilation means that there is no energy used to move air, instead it is the "natural" drivers moving air.
Reduced energy consumption
Natural ventilation regulates the indoor climate by a controlled air flow through the windows. Compared to mechanical ventilation natural ventilation uses only a small amount of energy when the windows open and close. A head to head comparison shows that natural ventilation has a 40% lower CO2 emission than a system with mechanical ventilation.