Too many elbows in furnace pipe a bad thing?

Discussion in 'Plumbing Forum' started by gwoloshyn, Jan 11, 2013.

  1. Jan 11, 2013 #1

    gwoloshyn

    gwoloshyn

    gwoloshyn

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    I have (2) 2" PVC pipes that are what I'm guessing are intake and exhaust for the furnace, both venting out a basement window.

    Due to some piping issues I need to slightly re-route these two pipes which will now have 3 or 4 elbows. Is this bad for the furnace and maybe not pass code in some areas? The total distance is only around 15 feet.
     
  2. Jan 11, 2013 #2

    inspectorD

    inspectorD

    inspectorD

    Housebroken Staff Member Admin Moderator

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    Look up your manufacturers instructions for the model you have, it will depend on each unit.
    Probably not a big deal, but you need to find out or it may shut the unit down.
    Good luck.
     
  3. Jan 11, 2013 #3

    Wuzzat?

    Wuzzat?

    Wuzzat?

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    There is Total Equivalent Length for elbows and it is given in terms of feet of straight pipe, so an elbow might be equal to 3' of straight pipe in flow resistance. Of course, I lost the link to this. You could try the Engineering Toolbox site.

    I suppose the furnace efficiency could be reduced to even lower values so then it becomes "How much more are you paying each month for this unorthodox piping?" and "What are your alternatives?"
     
  4. Jan 11, 2013 #4

    nealtw

    nealtw

    nealtw

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    I think each ninety equalls 5 ft.
     
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