An apparatus for guiding air through electronic components is disclosed. An upper end of the lower passage receives a portion of fuel flow from the nozzle, and a lower end is in communication with the tank. The Si unit includes a Si substrate and an insulating-layer unit in which wiring is installed. When in an open configuration, the louver permits air to pass through the ceiling vent assembly in a directed flow associated with the curvature of the louver upper surface.