Frurace replacement

mrgarlicMarch 22, 2014

I reciently move into a 29 year old log cabin. I would like to replace the original Olsen nat. gas furnace with a spiffy hi effency type.
My only issue is the "vent" that every one says has to be sloped back towards the furnace. The location [ kinda in the center of the main floor with no dirrect access to the great out doors] of the exesting furnace makes this impossible to do. What then are my options?
Please & thank you

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mike_home

You should be able to vent the new furnace out through the roof as you did the old furnace. You may have to install a stainless steel liner. This is a fairly common practice.

    Bookmark   March 22, 2014 at 9:50AM
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mrgarlic

Ah - ok I was hoping that was an option. Do I have to run the PVC pipe the lenght through the existing B vent up and out the chimney cap?
Many thanks

    Bookmark   March 22, 2014 at 11:12PM
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mike_home

Yes the PVC would effectively be the liner. I am not sure you would use PVC. There are flexible liners made for this purpose that would be easier to install.

    Bookmark   March 23, 2014 at 8:33AM
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ionized_gw

I turned on the DVR to set a record time last week. I watched for a few minutes as they pulled a vent system down the old chimney for a high efficiency gas furnace. It was flexible and had integral, flexible stand-offs that center it in the chimney cavity. The combustion air is drawn down through the cavity in the chimney around the plastic pipe for flue gas. The new chimney cap snapped onto the flue gas pipe and had vents around it for air intake.

Maybe this is what mike_home wrote about.

    Bookmark   March 23, 2014 at 2:47PM
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mike_home

Ionized,

I saw the same episode of this Old House. That set up may work.

I was always under the impression that high efficiency furnaces had to be vent out the side of the house. But a PVC pipe up through the roof also works. I think the key is the connections have to be water tight due to the condensation.

    Bookmark   March 23, 2014 at 4:31PM
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