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  1. #14
    Join Date
    Jul 2004
    Posts
    322
    Can I use silicone to seal the holes where wires go into the air handler? I have read that silicone while curing can mess up electronics if you put it directly on copper, because of acetic acid, but the wires are insulated.

  2. #15
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,415
    I've done that several times, works really good when you don't have any gromets to keep the wire from getting chaffed.

    It will be a PITA to get new wires in, or old wires out of that, so use it sparingly.

    One more thing, if there's no air leaking from the holes where the wires go through, you probably don't have to worry about sealing it up tight though. If you're worried about the wires getting nicked on the case of the furnace, just get a grommet or split a piece of small hose to use as a makeshift grommet.

  3. #16
    Join Date
    Jun 2000
    Location
    NC
    Posts
    108
    I use the 3" mastic tape on metal joints.

    I use the UL181FB tape that has the thread in it for the flex to metal joint. The mylar tape seems to me will after time get hard and then dirty and fall off.

    Flex duct states that the UL tape is to be used.

    I agree that the mastic paste and silicone are too messy.

  4. #17
    Join Date
    Jan 2005
    Location
    Seattle
    Posts
    191

    Talking Sealers

    First off. As far as getting messy.I get paid quite well to get messy.If you pay attention to the sequence of the assembly process you can minimize how much of the stuff you take home with you in your hair.And you want to be careful of that.If you take TO MUCH it might be considerd enployee theft:} I REALLY like the foil backed mastic tape.But the cost is somewhat prohibitive.When your starting out with fifteen feet of sixteen inch round going to a couple of elbows to jockey around a support beam.Than a reducer to another ten or fifteen feet of fourteen inch round.Then a fourteen to twelve inch reducer.a couple of five footers of twelve and a plug your talking fourty one feet of the stuff just for the trunk line.Thats not including sixteen to twenty plus take offs or branch lines!!! So a little messy is what it is.A word of caution for the people out there who have not used mastic. IF you get it in your hair.DON'T let it dry.Cause when you get home and show you just might start going bald before your time:{ ....:}
    41GASMAN



  5. #18
    Join Date
    Sep 2002
    Location
    South Dakota
    Posts
    6,579

    This thread is a shame! You people should know better. LEAVE this job to a PROFESSIONAL duct sealer also called a lagger. Sealing and lagging is a specialty. This is not something for an HVAC technician, duct installer or homeowner to attempt themselves.

    You people have already admitted that you are messy when you attempt to do this highly specialized work yourselves. You are simply not qualified for this work. You need to call a certified sealer and lagger who has taken the time to learn the trade, pass a series of exams and become certified. Besides this can be dangerous work to perform.

    The national association of duct sealers and laggers have their own website where they post photos of what they call the "Wall Of Shame". It is full of photos of sealing jobs that were done by non-professional heating and cooling people who thought they could do it themselves. (DIYers, they call us)

    The sealers and laggers post day and night on their site and they make fun of us all the time. They are making us look like fools. Please stop and call a pro and get the job done right!

    Norm

  6. #19
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,415
    woohoo! find me one close to where I live

    hoowee, no more pookying for me!

  7. #20
    Join Date
    Feb 2005
    Posts
    665
    Care to post that website??

    Apparently Google cant find it.

  8. #21
    Join Date
    Sep 2002
    Location
    South Dakota
    Posts
    6,579
    Originally posted by cool-blew
    Care to post that website??

    Apparently Google cant find it.

    Please don't tell me you think I am being serious! I am poking fun at those of us who continually inform homeowners that they need to call a pro for every little thing they attempt to do for themselves related to our industry. As if there are no DIYers capable of performing at least some HVAC work for themselves.


  9. #22
    Join Date
    Feb 2005
    Posts
    665

  10. #23
    Join Date
    Nov 2001
    Location
    Seattle, WA
    Posts
    7,774
    Well....thanks alot Norm! I took you seriously and got a bunch of lag bolts and bolted every duct joint so I could be professional. Do you have any idea how much time that took?????

    Now I find you are joking!
    "The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
    - Alexis de Toqueville, 1835

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