As suggested last year, I put cloves in the fire, but didn't smell any cloves coming out of the furnace. That is supposed to mean that the firebox is ok, a complete separation between the fire and the forced air.
So how did the soot get on the walls, especially where the hot air vents are in the walls or floor or ceiling?
Is the firebox breached even though I don't smell the cloves.
**It's amazing that even though I could never tell where the nails were before, there is a one-inch circle of light soot on top of most of them now.
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