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Thread: Smoke stack above and close to Cupola

  1. #1
    Join Date
    Jan 2013
    Location
    Bellaire, MI 49615
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    19

    Default Smoke stack above and close to Cupola

    Hey. We are getting ready to add a cupola to our shack. Reading through various threads its sounds like the best location for a cupola is directly above the evaporator pans. That also puts it very close to the smoke stack since it is very close to the evaporator pan. So my questions are -

    1. How high above the top of the cupola should the stack go?

    2. Is everyone's stack close to their cupola. Like 6"-8" away? Or am I better off skipping one set of rafters with the cupola and having it away from the stack but offset from the pans 24"

  2. #2
    Join Date
    Jan 2012
    Location
    Middlebury Center, PA
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    Rule of thumb is that your stack be at least 1 and 1/2 times the length of your evaporator. If your evaporator is 8' long your stack would be 12'. You want it to clear the cupola by at least a couple of feet in most cases the added height will help keep the heat where you need it.

    Do you have any hoods?
    Jared

  3. #3
    Join Date
    Apr 2012
    Location
    Michigan
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    Another consideration is are you using Class A pipe? This will allow 2" or in some cases 0" clearance to combustibles depending on brand of pipe.
    CDL 30x10
    Homebuild R.O.
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    1 mean Stihl 460 woods ported chainsaw

  4. #4
    Join Date
    Jan 2013
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    Bellaire, MI 49615
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    Default

    I think I am good with the height of the stack but am wondering are most smoke stacks close to the cupola. If so how far away?

  5. #5
    Join Date
    Apr 2013
    Location
    Brockport, NY
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    Take a look through the photo galleries here, sometimes pictures are worth the proverbial thousand words. Also some good ones at the other site (sugarbush.info). Although some are away from the cupola, probably most look to be "right there" near the cupola. take care, Mark

  6. #6
    Join Date
    Jun 2011
    Location
    Northern Michigan
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    My stack is less than a foot from the cupola roof edge, but I used double wall stainless chimney flue to avoid any problems from the heat.

  7. #7
    Join Date
    Nov 2008
    Location
    Adirondacks
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    2,785

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    By single wall stack is about a 2 feet above the top of my cupola and aboit 2 feet behind it. No issues
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  8. #8
    Join Date
    Jan 2010
    Location
    Upstate NY
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    Code for the height of the chimney top is that it needs to be 3' higher than anything within 10'. At least that is for a house. Just had a new chimney installed for the woodstove and that's what the guys told me.

    Tim

  9. #9
    Join Date
    Mar 2009
    Location
    Turner Maine
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    182

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    My stack is close to the coupla also. The first couple of years the smoke would come into the coupla during a down draft. I added another length of pipe and problem solved. I don't have any issue with heat where it penetrates the roof.
    Maple Ridge Sugar House
    230 taps for 2016
    12 X 16 Sugar House.
    20 X 66 CDL Evaperator.
    A good Wife that enjoys collecting and working in the sugar house.

  10. #10
    Join Date
    Mar 2009
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    Ashtabula County, Ohio
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    My stack is pretty close to the cupola, maybe 4-6". I designed a heat shield on the wall of the cupola out of metal roofing. I also wrapped my stack with ceramic fiber exhaust wrap. Its used on motorcycles. Has worked fine for a couple of seasons so far.
    1000 taps on vac down to 3 buckets, 140 taps on gravity tubing, 75 on 4008 Shurflo
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    Past evaporators: Phaneuf 2x6, A&A 2.5x10, Smoky Lake 2x8 (oil then wood fired)
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