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When using a down-draft vent system, should the greenware be loaded at the bottom so the gases are sucked out first and don't contaminate the glazed pieces above them?

The down-draft vent, such as the Orton Master Vent, draws air from the bottom of the kiln through small holes drilled into the firebrick bottom. Makeup air enters the kiln through holes drilled into the lid. The air removed from the kiln is vented outside through an aluminum dryer duct.

With the vent, you can mix glazed ware and greenware on the same shelf in the kiln. Because the atmosphere is oxygenated and replenished, glazes are not as affected by surrounding ware.

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