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Hi @gillianpearce! Those slots are for the electrical elements within the kiln. Those elements are coiled wires that run all the way around each section of the kiln. As they heat up, they heat the kiln and the tiles. I fire about 5-6 shelves of tile for each firing.
Thanks for following my process Gillian :-)

That must take a lot of firings then for a project the size of that swimming pool one! 😁

yes, MANY firings :-), over a hundred

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