In my installation, the ideal way to install my vent pipe would be a 90 at the back of the stove to a 15* at the wall. That would allow a nice even slope across the space, and avoid all horizontal run. Otherwise, using a 90 at the stove and going to a 45 leaves nearly 8 feet of horizontal run. I could probably fudge just enough of a rise by tweaking within the double wall but it would not be correct.
I can't find a 15 or even 30 degree elbow anywhere.
I can't find a 15 or even 30 degree elbow anywhere.