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Going to line my 18' chimney, I thought using rigid is the best way to go taking into consideration draft and build up. Even the best flex liners seem to have some ridges inside to collect creosote. Chime in please
If ridged will fit. Use ridged. If it won't use flex. Got two flex liners and the the dryness of the wood and how well you burn in the stove are what is going to make the difference.
Want twenty one feet of it? It is laying out on the back of my property after I pulled it after one season and replaced it with Simpson DuraFlex single wall liner.
Looks good on paper. Looks like chit when the inside de-laminates when you uncoil it.