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David,
One other thing...
While bringing up my furnace for the first time, I emailed a bunch of people with wire furnaces (made using Mark's plans).
Basically, what I found out so far is everyone I contacted has melted cullet only - not batch. However, this seems to reflect convenience and suppliers rather than any inherent problem with batch.
Since I cannot get cullet readily, and all the gas-furnace people in Calgary melt batch (either Seattle Batch or Spruce Pine), I will use batch (Spruce Pine).
-Richard
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