Metal Garage Ventilation

The insulation is sandwiched between the roof and wall panels and the frame so no air gap for the ridge vent to be doing anything. I like the idea of a vent on one end and a fan on the other and then if that's not efficient at air movement I can do what Dana67Dart mentioned and put ductwork inside to bring incoming air in lower. Saves me from swiss-cheesing the building by trying different inlet vents.
Thanks all!