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Clearances to Combustibles Theory

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by wkpoor, Dec 31, 2012.

  1. wkpoor

    wkpoor Minister of Fire

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    Just another reason why being UL tested doesn't mean crap to me. A product having the label or tag is not a bad thing. It just doesn't garantee the product is truely safe IMO and certainly says nothing about quaility.

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  2. tfdchief

    tfdchief Minister of Fire

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    wkpoor, being an inspector, I think you underestimate UL. But then there is nothing wrong with evaluating your product and situation and maybe going above and beyond what the testing lab specifies. I for one would have paid extra for a ceiling support box with MORE than the 2 inches clearance to combustibles required by the UL testing and label, but of course that is not available. I went above and beyond all requirements except that one......had no control over that. Well, looking back now, I could have framed the support box with metal studs but I didn't think of that at the time.
  3. northernontario

    northernontario Member

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    My previous stove was set up the same, except I also had a damper on the stove pipe in the 45° section... I think pulling it from the pipe when I did this install improved my draft a bit.

    I went in search of some real 45° elbows, none found in a 200km radius. My one 90° elbow, I'd love to redo in 2x45° sections to give it a larger bend radius. I'm still curious what has less draft restriction (and probably less air leakage), the adjustable 90° elbow, two adjustable 45° elbows, or the 90° corrugated fixed elbow.

    But now I'm off-topic.
  4. wkpoor

    wkpoor Minister of Fire

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    But now I'm off-topic

    As the OP I say carry on. I too have never seen a fixed 45. Having 2 or more adjustables seems bound to increase the leaks and or run a cooler pipe.
  5. begreen

    begreen Mooderator Staff Member

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  6. wkpoor

    wkpoor Minister of Fire

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  7. northernontario

    northernontario Member

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  8. Joful

    Joful Minister of Fire

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    Your stovepipe should be under constant vacuum, so no concern with leaking smoke into house under normal operation. In case of chimney fire, I suppose there could be a draft reversal, but then you'll have bigger problems than your adjustable elbows. Only down side I can imagine, with respect to the leakage, is a little cool air getting into the flue... almost certainly too little to matter.
  9. Joful

    Joful Minister of Fire

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    A UL tag does not imply quality, efficiency, or performance... but it does guarantee the prescribed level of safety.
  10. corey21

    corey21 Minister of Fire

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    I would rather have a stove that is UL listed then one that is not listed.
    Joful likes this.

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