air circulation

[Doug Odom <dlodom@charter.net>]

List,  The rules say you must have fresh air to the driver.  What is the
best system to circulate the air inside a enclosed car? It looks like a
NACA duct is the best for the intake. What about the exhaust? I see a
lot of NACA ducts mounted backwards, that just does not seem to me to be
the ideal way. But what the hell do I know. That's why I'm asking the
question.   Doug Odom in big ditch