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I saw your finished oven pic in another thread from a couple of months ago. You gave us no info about insulation or venting when you had trouble bringing your oven up to temp.
Perhaps you can tell us more about your oven? How big is your fire?
If your chimney and vent are in the middle of the oven (as it appears in the photo), you have your answer. I can't see how any oven with a central vent/chimney could ever burn white, you are losing all of your heat up the chimney.
You might want to download the FB Pompeii plans and see how it should be built. For your sake, I hope that photo is deceiving; if that vent and chimney are in the middle I am afraid you will always have performance issues.
The photo is deceiving, the Chimney is at the front of the oven. (I will show better pictures tomorrow). I don't understand what you mean about the vent.
By vent, I meant the smoke chamber. It appears to be located in front and above the inner entry as it should be.
But that photo is sure deceiving. That chimney looks like it's sticking out the middle of the dome. A side or 3/4 shot of the oven would be nice...