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  1. #1
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    Jul 2019
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    VA
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    Default High Efficiency Gas Furnace?

    I have seen quite a few high efficiency gas furnaces and they all have plastic exhaust and the burners are encased and not accessible because they are behind sheet metal. Saw one today with plastic exhaust but the burners were not enclosed and easily accessible. So my question is...are the burners on all high efficiency gas furnaces enclosed in sheet metal possibly with a small glass viewing window which makes a plastic exhaust pipe permissible (because the exhaust is not so hot) or am I looking at a system where its not a high efficiency system and the plastic exhaust pipe should not have been used?

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  2. #2
    Join Date
    Mar 2007
    Location
    Orlando, FL
    Posts
    1,578

    Default Re: High Efficiency Gas Furnace?

    In general, you need to look up the specifics for the model in question (such as manufacturer's install requirements).

    I wouldn't guess how a gas appliance is supposed to vent, without knowing what it is, etc.


  3. #3
    Join Date
    Mar 2007
    Location
    Santa Rosa, CA
    Posts
    3,108

    Default Re: High Efficiency Gas Furnace?

    Quote Originally Posted by Robert Huffman View Post
    I have seen quite a few high efficiency gas furnaces and they all have plastic exhaust and the burners are encased and not accessible because they are behind sheet metal. Saw one today with plastic exhaust but the burners were not enclosed and easily accessible. So my question is...are the burners on all high efficiency gas furnaces enclosed in sheet metal possibly with a small glass viewing window which makes a plastic exhaust pipe permissible (because the exhaust is not so hot) or am I looking at a system where its not a high efficiency system and the plastic exhaust pipe should not have been used?
    Robert,

    Without more information, I doubt anyone will be able to give you a solid answer.

    I have seen some Trane/American Standard Cat IV furnaces with PVC exhaust pipe and the burners were not behind sheet metal and a sight glass. However, the cabinets on these do have a pretty stout and gasketed cover/door over the entire front of the furnace.

    As Dom has already said, it is difficult to give you a specific answer without more information. Even a photo would help.


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  4. #4
    Join Date
    Jul 2019
    Location
    VA
    Posts
    24

    Default Re: High Efficiency Gas Furnace?

    Quote Originally Posted by Dom D'Agostino View Post
    In general, you need to look up the specifics for the model in question (such as manufacturer's install requirements).

    I wouldn't guess how a gas appliance is supposed to vent, without knowing what it is, etc.
    Good advice.


  5. #5
    Join Date
    Mar 2007
    Location
    Nampa, Idaho
    Posts
    601

    Default Re: High Efficiency Gas Furnace?

    High efficiency 90+ condensing gas furnaces can have both sealed combustion and open combustion burner assemblies. I commonly find the lower end models having open burners and the higher end ones having sealed combustion.


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