Well, my oven has three chambers: one for fire - the lowest, the second - for baking and also the third. As you can see in the drawing I added the previous post, the whole three chambers are actually a big one space, which is divided by trays for baking the bread on them. the trays are "standing in mid-air" so the heat can pass through to the top. Once the fire is on - the WHOLE oven is heated.
I placed the chimney on the top of the oven, and I was given advice that perhaps I should install the chimney aside the firebox, hopefully the smoke will come out of there and the oven will still be heated. but then, I lose a lot of heat, don't I?
Take a look at my pictures at picase web albums, it might help.
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Picasa Web Albums - Dotan - ב*יית ת*ור האדמה)
Greetings to all of you who'd answer and took a moment of their time helping me.
Dotan.