A cost effective way is to buy a Genturi exhaust from CW for just over $100. Or look online. Our AquaHot exhaust (diesel) is in the middle of our coach so when in any RV park and someone is next to us, we gas them out. Especially 5th wheels. So both for our own pleasure of being able to keep the windows on the drivers side open, and be good neighbors and do what we can to respect our neighbor and allow them to open windows, leave the door open or just sit out side we always put the exhaust system up.
Actually have 2 Genturi's. One for the Aqua Hot and another for the generator when dry camping. The only modification I had to make was grind out the exhaust tip just a little to fit the exhaust pipe for Genturi.