One more thing. I started first with the home made genturi on the awning side but still found the exhaust drone annoying. So I spun it to the other side.
You can find some easiy instruction to build your own genturi like the one in Y-Guy's pic. They are easy, cheap and work great. For easier storage, I started with a piece of pipe with the molded in coupler (like in Y-Guy's pic). I cut the pipe in half to make to 5' sections for easier storage. I mounted the flat bar and 90 elbow to a non coupler end. I use the molded in coupler to put the pipe back together when in use to extend above the roof.