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Thread: AC Duct

  1. #1
    Join Date
    Jul 2005
    Posts
    12

    AC Duct

    What are the problems with installing duct work on top of a flat roof and is it legal?

  2. #2
    Join Date
    May 2009
    Location
    South of Heaven
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    1,141
    People do it every day...weather and heat infiltration are the biggest issues that need to be considered when fabricating / installing .

  3. #3
    Join Date
    Jul 2005
    Posts
    12
    Thanks tech45
    We have a situation where the installation looks like a preying mantis on top of this house. Are there any issues regarding codes that you are aware of?

  4. #4
    Join Date
    May 2009
    Location
    WA
    Posts
    108
    on a residential install? I cant imagine that looking like anything but crap. just out of curiosity, what state is this in?

  5. #5
    Join Date
    Jul 2005
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    Florida

  6. #6
    Join Date
    May 2009
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    South of Heaven
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    I'd have to guess that this could just be a " free for all " ...no smoke / fire damper issues , no outside air requirements...just " run what you brung ". As long as the structure penetrations are firestopped I can't think of anything.

  7. #7
    Join Date
    Jan 2009
    Location
    Keokuk, IA
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    5,520
    I would definitely look at some sort of minisplit system, rather than place ductwork on the exterior of the home. Seems like you could also do a PKG unit and install ductwork in the corners of the walls at the ceiling and drywall frame around them. But that might be worse yet.

  8. #8
    Join Date
    Jul 2002
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    Zelienople, Pa
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    2,965
    Pictures or it didn't happen!
    How tall are you Private???!!!!

  9. #9
    Join Date
    May 2007
    Location
    Dry as a bone Tucson
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    4,302

    exterior duct

    The minimum insulation value is r-8 for exterior duct in az, and im sure its the same there.Heat gain is a huge problem and so is the jumbo sized duct after you have r-8 insulation in it.
    Some Talk, Some Do
    "keeping condensing pressures low and evaporator pressures high"
    "Some customers are more interested in comfort than energy savings"
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