If your new wood furnace calls for 6" pipe, then stick with that size. Using bigger pipe just results in a cooler running chimney that gets dirtier faster.
As far a double wall versus triple wall . . . you cannot judge the quality or performance of the pipe just by how many walls it has. The best pipe is the most fireproof (burn-out proof) and the most able to stay warm. Canadian specs call for pipe to withstand a chimney fire three times as long as US pipe specs.
Often the better Canadian pipe is not more expensive. Now, there may be more USA versions around that meet the Candian specs (I haven't checked lately).
Selkirk Canadian version SF Sentinel was the best on the market for years. CAN/ULC 4 S629 M84 Standard. Rated to 1200 degrees F continuous, 1700 degrees overfire for one hour, and 2100 degrees F for 30 minutes, three times - i.e. 90 minutes in all. It also has over 2" of insulation and stays very warm and clean.
The USA standard is lower: UL-103HT requires the chimney to withstand three 10 minute chimney fires at 2100�F. Rated for 1000 degrees F continuous.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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