Quote Originally Posted by dr. d View Post
i read somewhere, that as a safety precaution, the vents are designed so as not to allow one to completely close the passenger cabin from incoming air.
... lest we all die of suffocation (carbon monoxide poisoning).. that engine in front of us is a very potent CO generator..
You can just open the window for fresh air or to recirculate cabin air if on a long drive.





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