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    MWilens's Avatar
    MWilens Posts: 1, Reputation: 1
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    #1

    Dec 12, 2008, 01:34 PM
    How do I insulate an oil boiler exhaust vent?
    I have an oil fueled boiler in a lower level with a 30' run of an 8" exhaust through a crawl space to the chimney. The temperature of the exhaust near the boiler is 700F and it drops to 250F near the chimney. I would like to insulate it with something to reduce the temperature drop so that the temperature is higher at the chimney. Any suggestions of insulation that could/should be used to wrap this exhaust?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Dec 12, 2008, 03:56 PM

    Sounds like you are sending more heat outside than inside, just don`t sound right to me,, 700 degree exhaust,, even the 250f sounds outragious for exhaust,, you need someone to look your system over,, you are paying your money out to heat the world outside
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Dec 12, 2008, 04:53 PM
    You will also need a 1/4 inch per foot for minimum pipe rise. I would install a type L vent chimny or Metalbestos pre fab unit before I would run 30 feet. Adjusting that burner could be a problem with that long a run.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #4

    Dec 12, 2008, 05:53 PM

    At last, the source of global warming revealed...
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #5

    Dec 12, 2008, 06:07 PM
    Quote Originally Posted by KC13 View Post
    At last, the source of global warming revealed...

    Here is the helper.
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    KC13 Posts: 2,556, Reputation: 99
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    #6

    Dec 12, 2008, 06:09 PM

    Child stars... where are they now? Unbelievable how far R2D2 has sunk...
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