Working With Principles for Creating More Efficient ...
2013-2-14u2002·u2002To achieve this we will first set a low wall of bricks around the top edge of the base block. This wall will be two bricks high in the sections adjacent to the cooking rings, but only one brick high in the intervening sections. Next, insulation will be set around the edges of the passage, using glass wool salvaged from an old boiler.
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