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  1. #1

    Best insulation inside air handler?

    I'm wondering if anybody has any experience replacing the insulation inside an air handler. I have a situation where a condensate pan cracked and thoroughly saturated the fiberglass insulation inside a Carrier unit. I'm replacing the pan and want to replace the insulation, which is black and moldy now, but I wonder if there's any better alternative to the foil-lined fiberglass that Carrier provides. Does anybody have any experience or recommendations for a closed-cell product or something that might do a better job if it ever gets wet again?

    Thanks.

  2. #2
    Join Date
    Jul 2009
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    Columbia, MD
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    i have never done it before but i would use 1/2"-1" foam board and either glue it or use drives with screws to hold it in place.

  3. #3
    Join Date
    Dec 2010
    Location
    Palm Beach,Fl.
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    958
    I've used sheets of 1" Rubatex material with some success. Just gotta dry the unit really well and slather on some rubatex paint. Its a alot easier to work with than fiberglass IMO
    Quote Originally Posted by k-fridge View Post
    The laws of physics know no brand names.

  4. #4
    I need to do the same but I don't know if i can simply cut a sheet of styrofoam to the appropriate size and glue it on the bottom or if needs to be a different material. I'm considering styrofoam since it won't loose it's thermal properties if it gets wet.

  5. #5
    Join Date
    Jun 2010
    Location
    Philadelphia PA
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    It doesn't matter what insulation you use

    because the mold didn't grow on the insulation. It grew because there was LIQUID WATER and Organic material (DIRT) So the mold would have grow on anything or more clearly, on any surface
    You have got to learn from other people's mistakes! Because God knows you don't live long enough to make them all yourself !!!!!!!!

  6. #6
    Join Date
    Apr 2010
    Location
    southern california
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    535
    Quote Originally Posted by henryp View Post
    I need to do the same but I don't know if i can simply cut a sheet of styrofoam to the appropriate size and glue it on the bottom or if needs to be a different material. I'm considering styrofoam since it won't loose it's thermal properties if it gets wet.
    I would be hesistant to use styrofoam. The flame and smoke spread needs to comply with UL in this application.

  7. #7
    Join Date
    May 2004
    Location
    south louisiana
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    3,163
    I'm with acwizard about using foams.
    there is a reason foam isn't approved for hvac.

    I don't use foam products in returns or anything
    hvac related. ductboard, duct wrap mastics.

    I think you need to address why there is so much condensation
    inside the unit. let me guess...ahu is located in attic?
    until you address why there is so much condensation
    you will be changing insulation often.

    best of luck
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  8. #8
    Join Date
    Jan 2011
    Posts
    92
    Quote Originally Posted by energy_rater_La View Post
    I'm with acwizard about using foams.
    there is a reason foam isn't approved for hvac.

    I don't use foam products in returns or anything
    hvac related. ductboard, duct wrap mastics.

    I think you need to address why there is so much condensation
    inside the unit. let me guess...ahu is located in attic?
    until you address why there is so much condensation
    you will be changing insulation often.

    best of luck
    he said his pan is cracked

  9. #9
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    18,259
    Have you asked Carrier if they use the original style of insulation in a retrofit situation, or if they have something else that is approved for the purpose?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  10. #10
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,163
    my mistake about the pan location.
    there is a pan fix..asphalt I think.
    but pan has to be clean and dry
    and not rusted thru.

    best of luck.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  11. #11
    Join Date
    Jul 2006
    Location
    Virginia
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    what about just leaving the insulation out of the inside and wrap the air handler with duct wrap, just a thought

  12. #12
    Join Date
    Jun 2010
    Location
    Philadelphia PA
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    I like it

    Quote Originally Posted by catmanacman View Post
    what about just leaving the insulation out of the inside and wrap the air handler with duct wrap, just a thought
    How about a zipper for access
    You have got to learn from other people's mistakes! Because God knows you don't live long enough to make them all yourself !!!!!!!!

  13. #13
    Join Date
    Sep 2007
    Location
    Boise, ID
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    4,260
    http://www.armacell.us/WWW/armacell/...25775E003369BA

    Just about all insulation companies make fiber free duct liner if that's what you want, including Knauf, Rubatex and Owens Corning.
    If a nation expects to be ignorant and free, in a state of civilization, it expects what will never be. (Thomas Jefferson 1816)

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