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  1. #1
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,374

    filter turned black

    I went to a house yesterday & saw a filter they
    changed a few weeks ago. 1" pleated (I know...too restrictive)
    but what piqued my interest is that the filter is black.

    coverage of black over white filter is continuous.
    so much that I thought the filter was originally
    black.

    the a/c company owner says that he has seen this
    before & attributes it to the oak trees.
    says that on each house he has seen this filter
    turned black, that there were oak trees.

    personally, I'm all about air sealing the house
    & mastic sealing ductwork. if this were done then
    the outside voc's wouldn't be filtered through the
    a/c system.

    what I'd like is input from you guys on this:
    1- have any of you encountered black filters
    after one month of use?
    2- what would you attribute it to?
    3- whatever you'd care to contribute to the
    thread.

    tia!
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  2. #2
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    8,062

  3. #3
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,374

    pics

    I brought the filter home with me.

    homeowner says this happens in the fall only.

    here are pics
    Name:  IMG_2984.jpg
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Size:  111.3 KBName:  IMG_2986.jpg
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Size:  177.7 KB
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  4. #4
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    8,062
    Never seen that. If the homeowner is willing then I'd bring in outdoor air to pressurize the house. Do they burn a fire in the fall or burn a lot of candles? I've got oak trees all around my house and my filter doesn't look like that.

  5. #5
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,374
    house is being renovated.
    foam sealed attic isn't sealed.
    will be opening up soffits around house to
    make the foam seal while replacing soffit
    material.

    hvac guy says the candle/fireplace thing was his first
    thought. but no fireplace & they don't burn candles.

    I have oak trees too & my media filter doesn't turn black.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  6. #6
    Join Date
    Mar 2013
    Location
    Springville, NY
    Posts
    4,289
    do you have any trees that make the long bean-like things? chinese maple or some such thing... they make the same black stuff that coats everything
    Experience - knowing when to get the hell out of the way and plug your ears.

  7. #7
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,374
    mostly oak trees in his neighborhood
    a few crepe myrtles.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  8. #8
    Join Date
    Sep 2007
    Location
    edmonds wa
    Posts
    561
    Next to highway, railroad, airport, lot of neighbors who burn wood?

  9. #9
    Join Date
    Jan 2005
    Location
    Emerald Coast
    Posts
    967

    This black filter caught my attention ...

    .

    and then I opened the door!
    Attached Images Attached Images  
    Do not attempt vast projects with
    half vast experience and ideas.
    ...

  10. #10
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,374
    no to highway, railway & airport.
    neighbors may have fireplaces, but houses
    aren't close.

    LOL! Sleuth.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  11. #11
    Join Date
    Feb 2006
    Location
    Float'N Vally, MS
    Posts
    1,902
    Quote Originally Posted by energy_rater_La View Post
    I went to a house yesterday & saw a filter they
    changed a few weeks ago. 1" pleated (I know...too restrictive)
    but what piqued my interest is that the filter is black.

    coverage of black over white filter is continuous.
    so much that I thought the filter was originally
    black.

    the a/c company owner says that he has seen this
    before & attributes it to the oak trees.
    says that on each house he has seen this filter
    turned black, that there were oak trees.

    personally, I'm all about air sealing the house
    & mastic sealing ductwork. if this were done then
    the outside voc's wouldn't be filtered through the
    a/c system.

    what I'd like is input from you guys on this:
    1- have any of you encountered black filters
    after one month of use?
    2- what would you attribute it to?
    3- whatever you'd care to contribute to the
    thread.

    tia!
    1" pleats are only too restrictive if not sized properly....
    I have seen that alot. The owners burn wax candles.
    That is candle soot.
    Houses smell in the winter and owners can't open windows...
    Life is too short, Behappy!
    TFMM

  12. #12
    Join Date
    Sep 2007
    Location
    edmonds wa
    Posts
    561
    What fuel is the furnace burning? i am still thinking a unburned carbon based fuel. I would think there would be stains around the supplies too.

  13. #13
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,374
    no. not candles.
    gas furnace, no signs of soot on registers, doors of furnace
    or any indication that furnace is improperly installed or operating
    incorrectly. hvac install company was on site when house was
    inspected.

    name of the street is Live Oak Blvd.
    LOTS of oak trees.

    from the guesses, I get that no one has solved this
    issue if they've come across it.

    its kind of bogus to always assume that homeowner's
    lie about using candles, like ghosting is from candles
    & not lack of return air & air infiltration.

    so happy, you've seen the black filters a lot?
    or restrictive filters?
    The cure of the part should not be attempted without the cure of the whole. ~Plato

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