Forced air oil furnace venting question:

Discussion in 'HVAC' started by OverMyHead, Oct 24, 2019.

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  1. Oct 24, 2019 #1

    OverMyHead

    OverMyHead

    OverMyHead

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    My house was built in '72. I bought it in 97. I believe the furnace is the same as was installed at the time of construction. I assume it is a very low efficiency unit.

    Here is my situation. My roof needs to be replaced. I've discovered that my chimney is no longer sound. There is a very large gap(at least 1" iirc) separating the top half of the chimney, and the lower. There is a SS liner that I installed last year so at least I don't have to worry about CO, or other gases, entering the living space. The gap has come from the ground settling. The lower half sank with the concrete, and the upper half is basically being held up by the rafters.

    My furnace is in my utility room which is simply a bricked enclosure. It is only a few feet from the outside wall. I was hoping that I could tear down the chimney and run the flue out of the brick. I see that on high efficiency units, you have to have a fan that pulls the exhaust out of a direct vent configuration. Does that mean that I don't have to have a fan? If I could simply vent it out the brick, that would be awesome.

    Thanks
     
  2. Oct 28, 2019 #2

    billshack

    billshack

    billshack

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    yes, high efficiency gas furnaces are side wall vented, that means that an exhaust pipe goes out side ways, not up the chimney . as long as that is the only appliance served by the chimney you can re moved it or cap it off.
     
  3. Oct 31, 2019 #3

    OverMyHead

    OverMyHead

    OverMyHead

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    Thanks. Are Low efficiency furnaces able to vented out a wall also? No fan needed?
     
  4. Nov 18, 2019 #4

    billshack

    billshack

    billshack

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    . Are Low efficiency furnaces side wall vented. NO they go up the chimney they need that draft to work properly .
     

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