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Thread: flue length

  1. #1
    Join Date
    Mar 2005
    Posts
    9
    I inspected a property with a 75,000 btu gas furnace today. The flue was over thirty feet in length. The slope for the majority of the run was aprox. 15 degrees. Is this acceptable? I have found no data on the manufacturers site.
    Charlie in Brandon, MS

  2. #2
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    We need you to post a little more info. Model and serial, 90 or 80 percent, what type vent material, etc...
    Karst means cave. So, I search for caves.

  3. #3
    Join Date
    Sep 2002
    Location
    South Dakota
    Posts
    6,579


    The only way to know is to consult the specific flue sizing charts from the manufacturer for that particular brand and model furnace. There is no other way to know exactly what is correct.

    You should also know the different furnace classifications for flue types. There are different catagories of furnaces and their respective flues.

    I take it you are a home inspector.

    Norm

  4. #4
    Join Date
    Mar 2005
    Posts
    9
    Sorry,
    I did not find that data. Or rather do not know how to get that info from the data plate. It is part of a split system with a Rudd 3.5 ton HVAC side. It is about 18 mth old. Can you help?

  5. #5
    Join Date
    Mar 2005
    Posts
    9
    B vent

  6. #6
    Join Date
    Mar 2005
    Posts
    9
    Yes a home inspector

  7. #7
    Join Date
    Mar 2005
    Posts
    9
    May I infer from the silence that my profession is not liked here?

  8. #8
    Join Date
    Mar 2005
    Posts
    9
    Well gentlemen,
    Can you give me any general guidelines to inspect by?

  9. #9
    Join Date
    Feb 2004
    Location
    Ontario
    Posts
    700
    Don't infer anything. Get the mfgr's installation requirements and it'll tell you what you need to know. Never mind general guidelines, you want specifications for that particular make and model.
    Question authority!

  10. #10
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    If you post model number we can tell you the guidelines.
    Karst means cave. So, I search for caves.

  11. #11
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    Model number will be under the header that says "model number" and read something like UGPL-07EYGBS

    Serial nuber will be something like AN172 M3804 12345
    Karst means cave. So, I search for caves.

  12. #12
    Join Date
    Mar 2005
    Posts
    9
    Your points are well founded. I should have recorded that info in this case. One of the pitfalls of what I do is the time constraints placed on me. (No excuse for not recording the info to research this) We are trained to be a generalist- look for things that don't fit general guidelines and then call for review by a specialist. I believe I will call this for review. And lurk here on occasion.

    Thank you.

    [Edited by cbs on 03-12-2005 at 10:04 PM]

  13. #13
    Join Date
    Apr 2004
    Posts
    7,680
    Consult the national fuel gas code. Many mfg's dont publish 80% venting information because there is a higher authority. About time they print it the code can change. They do state that you should consult the national fule gas code for venting. All the mfg's tell you is what size pipe to run for a standard installation.

    Off the top of my head, 30' horizontal is too long, the weight of the cool air alone n the pipe will prevent a draft from starting.

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