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    bs21's Avatar
    bs21 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Mar 31, 2008, 08:40 AM
    Furnace flu duct has sand like substance
    This is my third year in my house and have just recently noticed that there is a sand like substance that runs up the flu from my furnace. My question is should there be a sand like substance in my flu duct. I am sure it has been there since I purchased the house and never really looked that close because everything is working fine. I am just making sure it is suppose to be there but in my thinking it should be empty. Any ideas?

    Thank you

    Bob
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Mar 31, 2008, 10:59 AM
    Gas or oil?
    Masonry Chimney termination?
    bs21's Avatar
    bs21 Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Mar 31, 2008, 11:13 AM
    Ok I hope I answer this correct. My father in law is also helping me answer this question.

    It is Natural Gas

    My flu pipe is

    Double walled metal pipe they call is metalbestes (sp? )

    Fireplace goes through a masonry chimney and both item terminate on the roof

    Hope this helps thank you for your time on this issue.
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