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  1. #1
    Join Date
    Aug 2007
    Posts
    273

    Do infinity supply and exhaust vents have to be insulated whe using a flu as a chase

    I have been told that I can use the chase of an old flue to run supply and exhaust vents up to the roof for a infinity carrier gas furnace. The run will be about 40 feet mostly in the chase. My question is do the lines have to be insulated? thanks

  2. #2
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    if it is unconditioned and prone to freezing temps then yes the intake and exhaust need to be insulated

    read the instalation book it will tell you

  3. #3
    Join Date
    Aug 2007
    Posts
    273
    Hi i live in washington dc and it gets cold in the winter so i take it that they have to be insulated? thanks

  4. #4
    Join Date
    Aug 2007
    Posts
    273
    How do contractors insulate the pipes? Can you buy them insulated? thanks

  5. #5
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    I have never insulated pipes running up an old flue, I have never had a problem with it.
    Karst means cave. So, I search for caves.

  6. #6
    Join Date
    Feb 2007
    Location
    michigan
    Posts
    71
    is the chase on an outside wall??? even so i would think not.

  7. #7
    Join Date
    Oct 2007
    Location
    BC, Canada
    Posts
    55
    if the chase runs through the middle of the house and say 10 feet is above the roof, i would say no. Make sure they fill the top of the chimney with insulation before capping it though.

  8. #8
    Join Date
    Aug 2007
    Posts
    273
    What about the instalation requirements of carrier which require it?

  9. #9
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,189
    You need to hire another contractor if you don't trust them to read the install manual.

    Or

    You need to ask them for the install manual and you can follow them each step of the way. That will make the job go much smoother.
    Perhaps you should have read the instructions before calling.

  10. #10
    Join Date
    Aug 2007
    Posts
    273
    The thing that concerns me is that several responses from installers on this board who I expect know the requirement feel its not necessay.

  11. #11
    Join Date
    Oct 2007
    Location
    BC, Canada
    Posts
    55
    Quote Originally Posted by ron3637 View Post
    What about the instalation requirements of carrier which require it?

    you mean the one that says if the pipes are 12' exposed to the outdoors? This is a semi tempered space. Plus when the pipes are vertical they will drain the condensate just fine.

  12. #12
    Join Date
    Nov 2007
    Location
    N.C.
    Posts
    170
    You shouldnt have to insulate the vents. I have installed them thru the roof, chimney, walls,etc. and never had a problem. Some contractors do insulate the pipes for piece of mind. They use armeflex or the insulation that you would see on plumbing or refrigeration pipes

  13. #13
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    contrary to popular opinion. Any time i run intake and exhaust pipes in an uncondition space that could be exposed to freezing temps i insulate then with armaflex

    i have found even tho it more then likely will be ok what about that one time it isnt. As i have always said once bitten once learned

    ran up a 20ft chase outside and didnt insulate the pipes and a real cold front came through exhaust froze at the bottom elbow. ***** to do after the fact when it doesnt take any longer to slide the armaflex over the pipe as you run

    if this chases is unconditioned then most makers want the pipes to be insulated even in a garage or chase. I have yet to read where it says may need to be insulated if the space is unconditioned

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