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Well, I've heard from the previous tech twice and all he offered was that it was something that couldn't be repaired, but all he ever did was to look down the chimney/exhaust out the roof of the house. I actually took the chimney all out to try and see what he said was the problem so I could better understand it and I have failed to see what could be causing a problem with the fresh air intake, which is what the tech claimed was causing the soot. The same tech put a new gas valve/pilot assembly on this furnace about 2 months ago. Is there any kind of a damper or vent piece in the top of this furnace that would fail, he called it a bevel.