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Stainless Liner Sizing

Post in 'DIY and General non-hearth advice' started by SIERRADMAX, Jul 26, 2012.

  1. SIERRADMAX

    SIERRADMAX Feeling the Heat

    Joined:
    Jan 13, 2011
    Messages:
    297
    Loc:
    RI
    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.

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  2. basod

    basod Minister of Fire

    Joined:
    Sep 11, 2009
    Messages:
    937
    Loc:
    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

    DAKSY Patriot Guard Rider Staff Member

    Joined:
    Dec 2, 2008
    Messages:
    5,400
    Loc:
    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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