source of air for mechanical Ventilation

We have a project that is natural ventilated in perimeter spaces (circulations and cafe dining rooms), and It is mechanical ventilated in core spaces (meeting rooms and cafe dining room) that is pursuing LEED for NC 2009. Our mechanical designer is wondering if the source of supply outdoor air can be an indoor natural ventilated space. What I mean is that we can locate the supply duct for the injector fan near to the operable window in the indoors? Any help, please? Thanks you! Dante Garcia LEED AP BD+C