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Back in the '70s Dodge Ford and Chevy stuck a square pattern in the back of their van roofs exactly for this purpose. Open up the max air a bit and it would double the airflow from the A/C. The front scoop/flap did nothing except seal off the front when it was open. Don't know what it did for roof airflow as I was driving an aerodynamic ugly box that at best got 18 mpg downhill with tailwind.
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