Sound In, Heat Out

The challenge is keeping the sound in and the heat out. I made an adapter coming off the muffler so I could channel the exhaust out of the box. I suppose I could get a better pic of how the adapter attaches; I wrapped the elbow with high temp aluminum tape for insulation and to keep the elbow from sliding around. The interior is all lined with foam board. The walls that face the house, have the studs turned sideways--that way there's room for insulation and sound transferring lumber doesn't go all the way through the wall.

Then, outside the foam board, there's a layer of fiberglass insulation. Even before putting all the vents in and roof on, it runs much quieter with a little sound barrier between the generator and the house. I walked AnnaMarie through the start-up procedure for the first time---she's able to manage it fine

A three inch duct will take the exhaust out. My adapter isn't a tight fit, I didn't want to create a backpressure issue (but I think 3" pipe for a short run won't be a problem)