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Yepper Chad, you are right on the money! Good point about extra air, I will need to be providing a way to get the smoke out of the chamber & also figure that air will provide some fine tuning on the temperature settings.

I am building the roaster double wall - aluminum inside with either brass or copper for the exterior pretty stuff, with 1" Superwool (Kaowool by another name) insulation from a pottery place.

I really didn't want to spring for the insulation as I wanted to keep the building costs below $75.00, however, I wanted to keep the power requirements down so that a 15 Amp circuit could handle the load. So far I have 3 Amps for the motor and 8.3 Amps for the heating elements. I can add another 500 W without any problems and still have power for the blower.

My initial test was using a 375 W halogen lamp as per original design parameters, the inside temp got up to 425 degrees F on an oven thermometer that was being bombarded by the light. A separate thermometer that was not in the direct light measured 400 . I need to purchase a thermocouple probe and reader. The chamber consisted of the superwool wrapped around a couple of metal end caps to provide an approximation of my intended sized roaster.

Best Regards To All,
Jon