There are factors to consider. First, It's a dragon 60lb unit and it has no flue. I'm not sure why that was the considered design but it could account for crud backing up in the chamber.
Now that being said, it's ostensibly a cullet, not a batch and it's hard to conceive of a cullet giving up that much junk. I think it possible that if is as dusty as it appears to be, that the dust could be contributing to the issue. I'd like to know what the appearance around the door of the furnace is. Does it have that tell tale yellow stain at the one o'clock position?
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Where are we going and why am I in this basket?
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