Curious, does the distance BELOW the thimble have an effect on draft? My chimney goes from basement up through the roof of my ranch. My stove thimble is roughly 60% up the chimney on the main floor. There is a cleanout about 3' off the floor in the basement. So there is approximately 10' of chimney below my thimble. Would Roxul insulation below the thimble provide any benefit?
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