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  1. #14
    Join Date
    May 2004
    south louisiana
    trojnstealth & comfort service,

    starting your own thread would be less confusing to those of us trying to
    reply. same for comfortservice. maybe mods will do this for y'all...
    also including location helps as does location/type of duct system.
    thanks comfort service for including this info. but what is insulation type?

    blown cellulose insulation, recessed lighting are contributing to the 'dust'.

    unless your recessed lights are ICAT (insulation contact air tight)
    the hvac system pulls in that fine ground newspaper dust that is
    treated with borate.
    you can tell which light you have two ways.
    from inside, removing bulb & carefully reading sticker inside of can.
    Note: read for what is air tight & what achieves air tight when
    'used with the following trim/inserts'.
    Halo is a common brand made by cooper lighting.
    if the can needs inserts, trims the sticker will have red circle around
    details. if its ICAT the circle will be orange.

    option two is to go into attic, move insulation back from housing
    & look for light from inside house. (cut lights on prior to getting in attic btw!)

    when the hvac system runs it forces air into the house, so leaks like
    can lights, oversized cuts at bath fans, stove vent fans & even the
    cut where the supply box enters the living space are all entries for
    cellulose dust.

    comfort service, in addition to the info above,
    return air leaks need to be sealed. r/a leaks contributes to
    higher RH.
    sealant...Mastic. paint on mastic for duct take offs @ plenum, &
    acessible areas, mastic tape for plenum to equipment connections.
    also removing the supply grills & using Hardcase brand #1402 tape
    in method in attached picture works well.
    I've tried other brands of mastic tape, but this is the one that
    holds strongly, tightly & for a long time.

    blower door testing & duct testing would be the best place to start
    for both of you.
    Resnet does duct testing as a standard, BPI may require requesting this service.

    best of luck to both of you.

    Name:  how to seal supply box from inside with MASTIC tape only.jpg
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    The cure of the part should not be attempted without the cure of the whole. ~Plato

  2. #15
    Join Date
    May 2004
    south louisiana
    for both paint on mastic & mastic tape hvac supply house, or your
    hvac contractor would be the best source for y'all.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

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