Stainless Liner Sizing

SIERRADMAX Posted By SIERRADMAX, Jul 26, 2012 at 11:43 AM


    Feeling the Heat

    Jan 13, 2011
    I have a 7x11" rectangular flue which I believe is 6"x10" I.D. I also have a 6" round thimble all of which service my 6" double wall stove pipe for my woodstove. I ran this for a couple months last year with decent performance but I would like to add a stainless liner for better performance and peace of mind. Can I squeeze a 6" round liner into my flue and thimble? Also, is it adventageous to insulate the liner? I have a 25'-28' tall chimney with terra-cotta flue which is insulated with rockwool between the flue and brick.
  2. basod

    Minister of Fire

    Sep 11, 2009
    Mount Cheaha Alabama
    Sounds like you'll have to get an oval liner. And you should be able to insulate it.
    There are adapters to make the connection to your existing double wall - provided you have access to the interior.
    A pic of the hearth would be helpful
  3. DAKSY

    Patriot Guard Rider Moderator
    Staff Member

    Dec 2, 2008
    Averill Park, NY, on Burden Lake II...
    With a chimney that tall, run a 5.5 diameter SS liner down with a 6" snout to make your connection thru the thimble. Run it like that for a half a season & when you clean it for the first time, you'll know if there is considerable cooling in the liner by the amount of build-up in it. Insulation can't hurt, but something like Thermix for insulating is a PITA & you'll never get that liner back out. You should have a top plate supplied with your liner & you can always use unfaced fiberglass or rockwool under that to keep the top of your liner from cooling too fast.

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