Just what type of material did you use for the thermal barrier?/
Where did you find it I have seen Fire bricks but nothing else the fire bricks look to run me about $ 200.00 for what I am doing .
i like the idea of the secondary air I think it can be added to my existing stove.
thanks again for a good write up.
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Some days it takes longer to pick which welder
then to do the welding 
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