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I’ve heard that firing an electric kiln with all the plugs in throughout the entire firing would damage the elements.

Elements last longer in an oxygen environment. Closing the peepholes for the entire firing would reduce the oxygen in the kiln, because the vapors from burning organics would remain inside the unvented kiln. This could reduce element life.

For best firing results, vent the kiln lid and leave out the peephole plugs at the beginning of the firing. After the venting period, insert the peephole plugs. (Leaving the top peephole plug out makes the Kiln Sitter tube last longer.)

The above advice does not apply to the downdraft vent. If your kiln has a vent, such as the Orton Vent Master, leave the lid closed all the way and the peephole plugs inserted throughout the firing.

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