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Woodstove question

Discussion in 'Off Topic' started by Modeler, Dec 29, 2012.

  1. Modeler

    Modeler Molalla, Oregon Soccer Fan

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    I've been considering replacing my woodstove. It's small and I have a hard time fitting the occasional long chunk of wood inside. My brother-in-law is doing some remodeling and is getting rid of his woodstove. It's nice and in good condition, but has an 8" flue; my current chimney is only 6". I know that 6" is considerably smaller (28 sq in cross section versus 50 sq in for an 8" flue), is it safe to neck an 8" flue down to 6" to fit the existing chimney?
     
  2. Dave Workman

    Dave Workman Western Washington Bronze Supporter Bronze Supporter

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    Necking down to a 6-inch pipe from an 8-inch flue could cause some problems with the draw. Be sure to mop out the chimney; that is, broom out creosote and ash deposits.

    Be sure to go inside the fire box and examine all of the bricks, replace any cracked ones.
     
  3. Mark W.

    Mark W. Silverton, OR Bronze Supporter Bronze Supporter

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    If you install a stove in your house it has to meet the current state regulations for everything. From Hearth construction to flue. If it does not pass inspection by the local fire inspector and something happens (a fire) even if it has nothing to do with your stove. Your home owners insurance will not pay out a dime.

    YOU NEED TO TALK TO THE LOCAL FIRE DEPT OR ONE OF THE BETTER WOOD STOVE STORES AND FIND OUT THE CURRENT REGULATIONS. Or you could be screwing your self something terrible.
     
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  4. hsullyc

    hsullyc North coast,Nehalem,OR Member

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    I see it done often but they always do it rite at the stove.Usually don't have many problems if your chimney goes strait up with no elbows.Try to look up the specs or installation instructions on the new stove,and see what they recommend.
     
    Nwcid and (deleted member) like this.
  5. RVTECH

    RVTECH LaPine Well-Known Member

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    Any neckdown will inhibit draw and going from 8 to 6 is a lot but as previously mentioned better to do it at the stove and figure on a twice in the winter brush out as the smaller the pipe the greater creosote build up due to less air flow. I had to neck down from 8" to 7" at the base of my roof jack when I installed a new wood stove in my house several years ago and the buildup of creosote starts at the transition of the 8" to 7". This summer however I am going to replace the existing metalbestos pipe with 8" standard triple wall.
     
  6. Modeler

    Modeler Molalla, Oregon Soccer Fan

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    That's kind of what I thought. I think I'll just pass.
     
  7. DieselScout

    DieselScout S Clackamas County Well-Known Member

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    My Dad had the opposite problem of many here. He needed smaller flew and had to reduce the diameter of his chimney to get the stove to draw. The smaller diameter made the gas move faster and caused the stove to draw better. Better draw lead to a hotter and cleaner burn. I would talk to someone who is familiar with chimneys and construction. They can tell you if its go/no go.
     
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  8. oknow

    oknow amboy wa. Well-Known Member

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    why not just replace the 6in with an 8in pipe it's just a matter of enlarging the hole in the roof and celling no real big deal
     
  9. Modeler

    Modeler Molalla, Oregon Soccer Fan

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    Permitting and material cost. It's a free woodstove ;)