Clay flue removal, ovalized liner, or attempt a very snug fit? (6" liner in 9x13)

[Guess52]

Planning install of a Blaze King princess 29 insert, manual states 6 inch liner "recommended"

Chimney inspection failed due to gaps between clay flue tiles, but no creasote observed. Inspection report indicates a 26' length and cross section of 9x13, consistent with my measuring about 7.5" ID. See pic.

I know that will be a tight fit after insulating the 6 inch liner. Too tight? My local dealer insists on clay flue removal. Am I irrational and naive to prefer keeping it? It's already there, why not try to keep one extra layer of insulation/protection/vertical support? Is sweeping a factory ovalized liner that much more of a pain?

My preference would be 0.010 single wall 304, light-heavyweight/crossover/hybrid, factory ovalized if needed. Between the smooth wall and height I'm not worried about the minor decrease in cross section with ovalized (tell me if I should be).

Dealer also doesn't seem very keen to move away from their standard 0.060 corrugated liner.

Thanks!

 

[begreen]

Why can't the installer slightly ovalize the 6" liner to fit? That should be easy with thin wall if they have the right setup. Also, Duraliner's 6" oval liner is something like 4 5/8 x 7 5/8". It's pre insulated and has fittings to transition to round at the insert and at the cap ends.

 

[Guess52]

Thanks and good question. I haven't gotten a great explanation, more of a "that's not how we do it here..."

I'm not particularly interested in thin-wall in any case. This YouTube video really sold me on the .010 stuff, and was consistent with comments from bholler in past threads.

To view this content we will need your consent to set third party cookies.
For more detailed information, see our cookies page.

Accept third party cookies

How does dura liner compare in terms of cost and longevity?