I have not installed anything yet.
I will have Lexan side windows in place of the factory door glass. I had planned on a NACA duct on drivers door window(where a front quarter window would have been).. then a reveresed NACA in the Right rear little back seat side window, to "pull"/vent cabin air out.
I thought this rule was to "POINT" fresh air in the cabin and an exhaust vent to Pull the smoke, fumes,dust,, etc... out... that was my plan,,, I was not piping this air to my helmet,,, just pointing the intake duct that direction...
I plan on using a cool air helmet air system piped direct from cooler behind drivers seat to my helmet for B'Ville..
Maybe I am all wrong,,, suggestions ??
Charles