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Flue pipe External temp v internal temp

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by ArsenalDon, Mar 1, 2013.

  1. ArsenalDon

    ArsenalDon Minister of Fire

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    So I have double walled insulated flue pipe inside going to the outside which then is Class A pipe...Disclaimer....I think I am recalling this all correctly from listening to my installer....the question is, I have an IR thermometer, is there a formula or a way to know using the IR what the temp is inside by shooting the outside? I can get an outside pipe temp of course but wanted to have an idea of what might be the temp inside.

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  2. begreen

    begreen Mooderator Staff Member

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    Not really. I have tried this and found the results to inconsistent. A probe thermometer will provide much more accurate readings.
  3. bag of hammers

    bag of hammers Minister of Fire

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  4. Jags

    Jags Moderate Moderator Staff Member

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    There is very little correlation to surface temp of double walled insulated pipe to the actual internal temp. Something as simple as what stage of the burn you are in could yield drastic differences in your reading. Get a probe and get the facts.
  5. ArsenalDon

    ArsenalDon Minister of Fire

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  6. ArsenalDon

    ArsenalDon Minister of Fire

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    is a probe easy to install?
  7. Jags

    Jags Moderate Moderator Staff Member

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    A drill with the appropriate sized bit. Done.
  8. certified106

    certified106 Minister of Fire

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    Definitely get a flue probe....... they only require drilling a hole through the pipe and sliding the probe in. You will feel much better knowing what the actual flue gas temps are doing.
  9. firefighterjake

    firefighterjake Minister of Fire

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    Two bits in my case . . . one smaller than the other . . . I forget the exact sizes.

    A 5-minute job with the first four minutes being me worried about somehow messing things up and destroying an expensive piece of doubewall pipe and so I read and re-read the directions.
    Trilifter7 and rideau like this.
  10. Jags

    Jags Moderate Moderator Staff Member

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    Good call. It should have said bit(s).
  11. bag of hammers

    bag of hammers Minister of Fire

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    Don't forget to remove it before you run a brush down the pipe. Just saying' (oops).....

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