[Arminius]

One more thing: I drove each return trip from the end of each test to the beginning of the next test with the fans off. I didn't smell anything, which is what I expected. If the high pressure is in the front of the car and the low pressure is in the back, the air will tend to flow to the back of the car and out the holes. Of course, the car isn't always moving, so that is always a concern - hence the fans staying on.