Originally posted by Les
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To answer your question, I had extra bricks basically. This was a big oven with a 49" floor and I erred on too many bricks buying 450. I finished the basic dome and chimney foundation with 400. That left me with 50 more bricks and it seemed to me that if you recirculated the hot air over the dome, maybe it would heat up faster as the hot exhaust from the oven is in contact with the dome from the inside and the outside.
I have seen some masonary heaters with recirculating channels to capture more heat into the central mass and it kinda made sense.
The other thing is I am gaining 3 feet of chimney before I even go vertical so I hoped for better draw. The final thing that pushed me over to do all the extra work was the MHA oven design I stumbled across:
MHA News - 2006 Meeting - Backyard Oven with Peter Moore
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