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  1. #1
    Join Date
    Aug 2006
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    Is it acceptable to seal a plenum attachment to the air handler with mastic from inside the air handler only?

    Does the mastic affect air quality?

    Thanks in advance,


  2. #2
    Join Date
    Dec 2005
    Vero Beach, Florida, United States
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    Mastic and membrane the inside and silver tape the outside. If you are 4 piecing it as a transition from some other size duct its the only way Id do it.

    If its a duct that is the same size as the furnace/coil outlet, you could simply mastic inside or even just tape the outside.

    Hope this helps...

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