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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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