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  1. #1
    Join Date
    Aug 2006
    Posts
    4
    Hi,

    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,

    jmuzic

  2. #2
    Join Date
    Dec 2005
    Location
    Vero Beach, Florida, United States
    Posts
    2,675
    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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