This link has additional explanation and good photos of the construction of flex, and why the direction is important.
Flex liner safe to use after small chimney fire? Pictures
- Thread starter philip_sallee2
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![[Hearth.com] Flex liner safe to use after small chimney fire? Pictures](https://www.hearth.com/talk/data/attachments/251/251897-341dac784d8c7ef261a3e00be48f205e.jpg?hash=iR7WgGhK0f "[Hearth.com] Flex liner safe to use after small chimney fire? Pictures")
It is not with regular corregated light wall liner. But it is important with heavy wall and mid weight liners which are single ply
is there a way to tell besides sticker ? i looked from the top and bottom of mine and see no difference
The SBI liner - 6"Ø X 35' VORTEX STAINLESS FLEX LINER KIT FOR INSERTS
(broken link removed to https://myfireplaceproducts.com/us_en/6-o-x-35-vortex-stainless-flex-liner-kit-for-inserts-volki-635)
From what I can tell that is just standard lightwall liner. Is it smooth inside or is it corregated?
Corregated, the only info i found was an answered amazon question that said "
The liner offers a strong 7-ply seam, which is air and water-tight.
The liner has ten corrugations between each reinforced seam "
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