This area of my CarBEN model was a bit nebulous - I was working with a Smart ForTwo model that I got from the Internet, and the structure around the firewall and the windshield wipers. Which I have on hand now - I'll try to photograph it as I carve into the firewall.
This is the kind of issue that increases my respect for car designers - air flow needs to get into the inside of the car, but rain water needs to be drained away.
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