I saw in my Jim Carter Catalog a picture showing the improved air circulation and the oval holes in the back cab corners are where the dotted lines go from the vents, so they must be outlets for the the air to escape(and rust to begin)- So on my nightly drive I closed the windows and opened the vents and felt a decent amount of air flowing still.
I would like to drive the art deco model since it pre-dates the cab that breathes to see just how much of an improvement the ad cab is.
