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Jim,
The idea is to make the transom as small as possible. Thus, if my taillights allow it, my transom will be six inches tall, exactly as tall as a license plate. If you exhaust air above or below the plate, you're increasing the size of your wake. It's a small point, but worth considering.
The photo of the cabin vents I posted was file footage from my trip to the junkyard. You should be able to see the vents from the inside if you pull the cargo basket. Hmm, I wonder if you can feel the flow back there if you turn the blower to high. Anyway, my best guess is 16inē.
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