Originally posted by eirebuild
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i cannot remember exactly from memory but i seem to remember using roughly a full brick at the peak (the top brick) then gradually getting smaller towards the bottom of the arch. This was for the structural arch, then my vent entrance where the chimney forms was another brick and a half deep as far as i remember with another half brick as a decorative arch. So from this id guess at around 450mm depth with another optional 100mm on top for a decorative arch. I can double check the measure tomorrow by measuring the oven if that would help
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