I would like to clarify my previous answer, I agree with the above comments that you should not smell engine exhaust in the cab, my suggestion for the fan was IF the cab enclosure was causing these to be sucked into the cab, a fan MIGHT offset this.
I will add that we have a typical soft side enclosure on our quietech and have never smelled exhaust in the cab, so I also agree that the owner needs to go back to the dealer to remedy the situation.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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