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Thread: pipe diameter for 2x4

  1. #1
    Join Date
    Feb 2018

    Default pipe diameter for 2x4

    picked up a smokey lake 2x4 that came with single wall 7" flue pipe. I want to put double wall through the roof. Stack would be about 12'. Would putting a reducer to accommodate 6" pipe at the top of stack have much impact on boiling rate? 6" double wall is easier and cheaper to find that 7" double wall.....

  2. #2
    Join Date
    Jan 2006
    Oneida NY


    By double wall I hope you mean a class A insulated chimney. Just double wall in uninsulated will get too hot and could set the roof on fire. On a 2x4 you could likely "get away" with a 6" as long as the stack total is 12', but if you go to an 8" you would then be set for your next larger evaporator, a 2x6 and could use the same thru the roof stack. It all depends on what your plans are for 5 years out.
    If you are likely to get a 2x6 in 3-5 years, the long term will cost more now but less in the long run. If you are unlikely to expand to where you need a 2x6 until 6 years or beyond a 6" is likely the best call.
    Last edited by maple flats; 11-05-2018 at 03:39 PM.
    Dave Klish about 1320 taps in '15, down to about 700 in '16, up to 1000 for 2019?
    2012 Mahindra 36 HP 4x4/ loader/cab/heat/AC:-)
    added a gooseneck equipment trailer and F350 to tow it to haul more sap
    3x8 raised flue evaporator
    250 GPH converted to electric, RO by Ray Gingerich
    6.32 KW solar system, 1.48KW is battery backed up, all net metered
    website: www.cnymaple.com

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