Thanks for the replies. No stink problems, no gas problems. The sqft of the exhausting air was well in excess of what was required for the size of the fan.
There is definitely a point of opening the door that maximizes the flow and then falls off. Too much time, nah, just a curious mind.
Carbon Fiber MKI - sold
66 GT350 clone - sold
Austin Healey 3000 - sold
TR6 - project started