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new heat riser design

 
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a small hole in every other brick(top and bottom) could be drilled 1 in deep and a steel rod 2 inch inserted as a pin for vertical stability then cracks and grooves filled with furnace cement.

Stacked
Only with out groves cut in them
26-Firebrick_clamped_together_in_a_hexagon.jpg
[Thumbnail for 26-Firebrick_clamped_together_in_a_hexagon.jpg]
 
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