Le Corbusier and Mur neutralisant

The first double façades mentioned in literature are those designed around 1930 by Le Corbusier, who proposed to counteract thermal loss and overheating by "la respiration exacte" and "le mur neutralisant". The "respiration exacte" concept relies on a mechanical ventilation system to guarantee comfortable internal climate conditions. The "mur neutralisant" idea is based on mechanical circulation of warm or cold air inside the air gap of a double façade that is only a few centimetres thick.