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When you want free ventilation, you have to be sensitive to the air. Good ductwork can cost more than fans, and it is bulky, so you don't see a lot of it. The air exiting the cooling chamber won't want to accelerate instantly. It needs a nozzle, or in this case, a flat, tapering duct. Unlike the nozzle in a paint-spray gun, it will only be getting help from one side to sweep the exiting air away and make room for more. Fortunately, if the intake is nicely placed and well-ducted and sealed, there should be lots of pressure difference to help. In planning the belly pan, leave clearance for that air all the way back. It will be a sudden thickening of the boundary layer.
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