My set up is quiet different from yours.. The genny exhausts to the side, near the black water bay. BUT the problem is the same,, Exhaust fumes rise into the motor home via assorted routes, I am starting to find a few of them.
Hoever there is a cure... It is made by Camco and it is called a GEN-TURI
This uses the venturi principle it consists of a bag of adapters so it fits yoru exhause, one or more of these clamp on the exhaust pipe Then we have a SWEEP ELBOW (large radius elbow) that has 3 prackes on the end of it, these hold a polycarbonite pipe Very light weight, black in color and much larger then the sweep.... Exhaust "Jetting" out the sweep sucks in cool air via the Gen-turi principle so the pipe remains fairly cool.. HOW cool, after several hours of operation you can hold it in your bare hand with generator still running for several minutes.. (Though one time it got too hot to handle.. but it was SUNLIGHT, not Generator that made it that way)
This takes the exhaust fumes up above the roofline, from there they continue their upward journy up-up. and away from your living quarters.
Some folks yammer about the rootop air conditioenrs sucking in this exhaust.> Two answers to that
First.. The rooftop A/C is in the center of the RV, at the minimum six feet from the Genturi.. So by the time the exhaust gets over to where the A/C is it's already at lest 12 feet ABOVE the A/C. 2nd the A/C does not move air from Outside to inside, if anything it's the other way around.
