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Some kilns (probably make for pottery firing) have a vent – this should be closed for annealing. If this was mine, I would also pack the vent with some fibre blanket material.
A friend (pro glass artist & often makes coloured boro from rare materials) told me his method for determining annealing temp for unknown glass;
Suspend on blocks, both ends of glass rod (small diameter, the longer the better) in the kiln.
Very slowly increase temp until the rod just starts to bend, this gives you the temp just above annealing temp.
If you know the annealing temp of glass, this method can be used to check a kiln’s temp.
Peter
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