And now for something completely different

zoomidee@yahoo.com

This may seem like a strange place for this posting, but as you read on I trust that you'll find it appropriate.

I am building a home-flavored coffee roaster. It's a simple design. Over-simplified, I have 2 4" B Type gas vents with an inline fan the vent pipes lie parallel (vertical) and are attached at the top and bottom to form an 'O' type shape.

At the bottom of one, there is an opening to allow for a heat source to induce heat into the piping. The heat delivered should allow for a temp. of 450F 1' from the heat source (up the pipe). An inline fan will be positioned 8" above the heat source to suck the hot air up anf provide circulation on teh 'O'.

OK, question: What heat source can I use that will allow me to regulate the heat. Something in propane will need oxygen, so it'll have to be exposed. Something electrical can allow for the unit to be sealed (save for a small chimney that'll be at the top). The downside of the electrical is that the temp cannnot be adjusted rapidly.

I also need an inline fan that can withstand the high temp.

Ideas, suggestions? Questions?