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Exhaust venting for oil furnace

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alyssa
alyssa Member Posts: 1
in Oil Heating
Currently my oil furnace vents into the chimney.  I want to change it and vent the furnace out thru an exterior wall that is located 10’ away.

If I run a 10’ horizontal vent
 ( with a  correct pitch ) and then run a stainless  steel chimney 30’ up the side of the house (with two elbows total) Is this design problematic ?
Will it be more prone to condensation, poor air draft...?

Thanks

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,523
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    30' up will be fine you will get plenty of draft. Just make sure it is sized properly and installed with the correct material. Combustion test and adjust the burner afterword.

    Why not just put a liner in the existing chimney
  • Robert O'Brien
    Robert O'Brien Member Posts: 3,541
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    NFPA31 requires a draft inducer on any horizontal run over 10'
    To learn more about this professional, click here to visit their ad in Find A Contractor.
    STEVEusaPA
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,506
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    I don’t like it. Probably going to be ugly and most likely problematic with a cold chimney, condensation and draft.
    If you can’t line the chimney, because it’s mechanically unsafe, don’t want to fix it, or want to eliminate it, you’d be better off with a properly installed power venter.
    And depending on your equipment, you may be able to direct vent it.
    steve
    SuperTech
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,834
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    Not a fan of outside vent systems. But they are acceptable alternatives with class A venting systems. What will it look like? Can you design an enclosure with proper clearance and use complementary siding to make the enclosure look acceptable? Match the existing siding, or use stucco to offer a masonry appearance. The interior of the enclosure can be insulated to reduce the flue gas condensation issue.

    Make sure there is easy access for cleaning the base of the chimney.

    Mr.Ed
    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
  • SuperTech
    SuperTech Member Posts: 2,160
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    Power vent is a much better option, but they require annual cleaning and oiling that a lot of guys overlook. They are also just another thing that could fail or cause problems.  I've been to so many that never had the draft damper adjusted properly, they were installed wide open causing a draft of over -.1" with the barometric damper open fully. Not a fan of power vents and I like direct vent less. I would line the existing chimney if possible.  Its probably the easiest and least expensive option.  
    STEVEusaPA

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