New Englander NC30, old drafty house, 9ft of single wall to ceiling, 12 feet triple wall to roof straight up. 3 ft above the peak. Having issues with wood smoldering, not burning hot. With door closed, no flames. Smoke is going up chimney ok, definitely not blocked. Suspect wood issues. What is best way to determine this? Anything else I should consider? It is 50+ outside...
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