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  1. #1
    Jim B. Robinson's Avatar
    Jim B. Robinson Guest

    Default Conventional Gas Furnace Question

    What year did mfg's stop producing conventional, natural-draft gas furnaces, or at least start phasing them out.

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  2. #2
    Join Date
    Mar 2007
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    Spring Hill (Nashville), TN
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    Default Re: Conventional Gas Furnace Question

    Quote Originally Posted by Jim B. Robinson View Post
    What year did mfg's stop producing conventional, natural-draft gas furnaces, or at least start phasing them out.
    Are you talking about when they started to use induction fans?

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  3. #3
    Jim B. Robinson's Avatar
    Jim B. Robinson Guest

    Default Re: Conventional Gas Furnace Question

    Yes, in a way. I'm interested in when the reliance on indoor combustion and dilution air was being phased out.


  4. #4
    Join Date
    Mar 2007
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    Plano, Texas
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    4,170

    Default Re: Conventional Gas Furnace Question

    It is still the standard in my area. Although most furnaces are mounted in attics so are using outside air, they are not sealed combustion units.
    It would take a long time to get the ROI due to the fact that I am in a predominantly cooling climate.

    Jim Luttrall
    www.MrInspector.net
    Plano, Texas

  5. #5
    Join Date
    Mar 2007
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    Spring Hill (Nashville), TN
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    Default Re: Conventional Gas Furnace Question

    Jim B., we still use make-up combustion air from the room if it is large enough. In my home, my furnace is in the attic. In homes that have them in a room that is not large enough, they add make-up air systems like a "High-Low" vent or they use a direct vent that draws the combustion air from the exterior of the homes envelope.

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  6. #6
    David Bell's Avatar
    David Bell Guest

    Default Re: Conventional Gas Furnace Question

    You will still see natural draft gas boilers, but furnaces are few and far between. The manufacturers found they could make a power vented furnace with about 1/3 less material and charge more for it. The early 90s saw the biggest change.


  7. #7
    Join Date
    Mar 2007
    Location
    Oregon
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    2,365

    Default Re: Conventional Gas Furnace Question

    If I had to pick a time I'd say late 80's - early 90's was when the changeover took place.


  8. #8
    Jim B. Robinson's Avatar
    Jim B. Robinson Guest

    Default Re: Conventional Gas Furnace Question

    Thanks for the information!
    Appreciated, Jim


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