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changing angle of thimble

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by 91LMS, Apr 2, 2013.

  1. 91LMS

    91LMS Member

    Joined:
    Oct 20, 2011
    Messages:
    192
    Loc:
    MAINE
    i am getting ready to build a chase around my interior chimney so that i can wrap it in stone. the chimney is in a corner and would like to angle the thimble where it will come throgh the stone in order to get a straighter approach for the stove pipe off the hearth. kind of a screwy set-up, any suggestions?

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  2. JonOfSunderland

    JonOfSunderland Member

    Joined:
    Feb 3, 2008
    Messages:
    107
    Loc:
    Western Mass
    I think the questions most people will have are:

    1. Why on earth did you build a masonry chimney?
    2. Why on earth did you build it with what appears to be an 8x12 flue?
  3. 91LMS

    91LMS Member

    Joined:
    Oct 20, 2011
    Messages:
    192
    Loc:
    MAINE
    no suggestions?
  4. JonOfSunderland

    JonOfSunderland Member

    Joined:
    Feb 3, 2008
    Messages:
    107
    Loc:
    Western Mass
    I myself have my stove vented in to an 8x12 flue and the only reason I haven't destroyed it and replaced it with a 6" stainless is because I don't plan on being in this house long term.

    Most of, if not all, wood stoves suggest venting in to a flue that is the same cross sectional area as the outlet of the stove and not more than 2x the cross sectional area. And the vast majority of stoves have a 6" outlet. An 8x12 flue has 3.4 times the cross sectional area.

    If the chimney is still at the stage of construction shown in the pic, I'd suggest you to stop and reconsider the design. You'll be much happier with the operation of the stove if you size the flue according to the stove you plan to use. 8x12 is way too big for any modern stove. Perhaps the block chimney with a stainless liner, or a 6" round clay tile?

    That all said, if you're going to stay with what you have, have you picked out a stove? That will affect what you need to do to adapt it to your chimney, depending on where the outlet is (top/rear).

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