[planebuilder]

I am planning to build an 8' x 8' x 24' gas oven. I have a container to insulate and plan on building burners or setaling them from old gas furnaces. I have looked at lots of pics and drawings on the net of gas ovens and am not convinced that a heat exchanger that completely isolates the flame from the interior is common. It seems the flame is shielded and the exause and heat enters the oven proper a little downstream, and then recirculates behind baffels and through the flame area again...Does anyone know for sure!