Sharing Common vent with a boiler?

Discussion in 'Boiler Forum' started by plumber69, Nov 16, 2020.

  1. plumber69

    plumber69 In the Trades

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    Can I use the same exhaust vent for an old Laars Mighty-therm with a new mighty-therm 2 which has a inducer built in
     
  2. breplum

    breplum Member

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    What is the old vent?
    There charts in the UMC for induced draft appliances and the chart must be followed.
     
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  4. plumber69

    plumber69 In the Trades

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    6" and 8" would tie into 10" via wye. Its goes up thru the roof
     
  5. fitter30

    fitter30 Well-Known Member

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    Forced draft have to be below natural draft. Need to know btu ratings of each heater to know if 10" is big enough and height of flue. Lenght of laterals.
     
    Last edited: Nov 17, 2020
  6. plumber69

    plumber69 In the Trades

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    Below, you mean first in line,
     
  7. fitter30

    fitter30 Well-Known Member

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    No natural vent higher than power vent
     
  8. plumber69

    plumber69 In the Trades

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    Still confused, right now the natural vent boiler vents left, picks up induced vent, then exits chimney
     
  9. fitter30

    fitter30 Well-Known Member

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    This pic is what you have. Thumbnail pic What you need is two separate pipes going into the ten inch. IMG_20201118_154453.jpg
     

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