a ventilation system for an avionics bay has two strut assemblies for stiffening the floor of the cockpit , each strut assembly being arranged symmetrically regarding to the central plane of the aircraft , and means of distribution of the blowing air in the cabinets of the bay from the strut assemblies . the extraction circuit includes exhaust ducts integrated in the cabinets and couples together by tight inter - cabinets junctions in an overall configuration of maximized compactness .