Abstract: A double-wall facade element for buildings having an overpressure ventilating or air conditioning installation wherein at the region of a horizontal edge of the element there is provided at its inner wall a throughpassage opening for exhaust air and at the region of the other horizontal edge there is provided at its outer wall a blow-off or exhaust opening for the exhaust air, both openings being in flow communication with one another via an intermediate space or compartment between the inner wall and the outer wall. The flow cross-section of the throughpassage opening is greater than the flow cross-section of the blow-off or exhaust opening, but smaller than the flow cross-section of the intermediate compartment.