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Ok, so the issue is that the flame will not burn clean, and so produce more soot than usual? Then when the flue is sooted shut, you get the "puff" - right?
So, I will have a mess by the furnace in the basement, but not throughout the house, right?
I would think that it would take a couple days or more to build up that much soot, so if I check the firebox daily, I can leave the furnace running until it is replaced - right?