Air cooled chimney lining question

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oldbrick1974

New Member
Nov 9, 2022
10
Iowa
Hey guys,
After several days of cursing and unbridled violence in an enclosed area, I've successfully removed my old Heatilator Mark 123 to make way for a new insert. I lucked out an found a brand new Lopi Freedom for $1,000. My question is what to do with the existing stove pipe.
It's around 8.5" ID and 14.5" OD and approximately 22'8".
After doing some reading, I was pretty convinced the 6" stainless steel flex liner was the way to go, so I ordered 25' of Forever Vent double ply. Then after some more reading and finding numerous "double ply is crap" comments, I canceled the order.
The piping is mostly a straight shot expect for two 45s near the base. I have access to an HVAC discount so would I maybe be better off dropping down some ridged or going with a single ply flex and wrap it in insulation?
Any help or suggestions would be highly appreciated. I have a mason coming to set the stove in January and would like to make sure I have the chimney ready for him beforehand.
Sorry if the photos aren't clear, it's very cold here so I had to shove a bunch of stuff up the pipe to stop the downdraft.

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