Additional kiln information
The information about kilns (above) was based on my type of glass working (& annealing off mandril sculptures, etc).
When the kiln door is opened, the electricity must be turned off to the heating element.
If the kiln has a mandril flap, this may not happen. You don’t want the mandril to be able to touch the heating element (electrocution!), thus the heating element probably should only be on the roof of the kiln (& accept some oscillation in temps).
Kilns designed for slumping often have just a roof element, to let the heat ‘radiate’ evenly down to the plates. etc.
Peter
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