Ordered some new stainless steel which arrived today, so I made a new, improved duct.
This one differs from the first duct in two main areas:
- The parts are a much better fit...not warped, and reduced gaps.
- I added a "roof" to the duct so that the air wouldn't be exposed to
the ceramic brick while moving from the back of the oven to the front.
We'll see how it works tomorrow.