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Thread: HVAC System

  1. #1
    mathew stouffer's Avatar
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    Default HVAC System

    Do you report when you see uninsulated ducts in areas with no heat.

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  2. #2
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    Default Re: HVAC System

    Are these type of ducts allowed anywhere in HVAC, regardless of heated or not heated area?


  3. #3
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    Default Re: HVAC System

    That looks like insulated flex duct! Not sure of your question!

    James Bohac

  4. #4
    mathew stouffer's Avatar
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    Default Re: HVAC System

    It's flex duct but there is no insulation.


  5. #5
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    Default Re: HVAC System

    Quote Originally Posted by Brent Crouse View Post
    Are these type of ducts allowed anywhere in HVAC, regardless of heated or not heated area?
    Without being there to verify there was no insulation ... those look like "air connectors" and not "air ducts", and "air connectors" have a VERY LIMITED use and a VERY LIMITED length.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  6. #6
    mathew stouffer's Avatar
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    Default Re: HVAC System

    Jerry, there is no insulation. They are very thin. The runs seem pretty short, limited to the closet space.


  7. #7
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    Default Re: HVAC System

    For one thing, they are not supported properly, as to whether they are even allowed to be used there is another concern - would need to have more information, such as the UL number on them, the manufacturer, etc., as they may (or may not) even be allowed to be used in that installation.

    If that closet is not within the thermal envelope, then the answer is not allowed, if that closet is withing the thermal envelope ... maybe ... is the best I can do right now - but you can write them up for not being properly installed, and from there have a properly licensed and competent mechanical contractor determine if those uninsulated air connectors are even allowed.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
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  8. #8
    mathew stouffer's Avatar
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    Default Re: HVAC System

    Well the thermal envelope is a tricky question. It is a utility closet within the garage and the walls may or may not be insulated. They likely are insulated because there is a bedroom and bathroom above the area. I will get more info off the duct when I return to grab a radon test. Thanks for the help. The installation looked like a bit of hack job to me, but what do I know


  9. #9
    David Bell's Avatar
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    Default Re: HVAC System

    Looks like the homeowner wanted some extra returns in the house. Complete hack job.


  10. #10
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    Default Re: HVAC System

    Those look like dryer slinkies, not real HVAC flex duct. I don't think it is insulated. Lack of support and poor install are easy write-ups. I'd add verify proper CFM to rooms by HVAC contractor. Those look like maybe 4", which isn't going to sufficiently supply anything beyond a bathroom. Don't see a bypass on that HUM either.

    www.aic-chicago.com
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  11. #11
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    Default Re: HVAC System

    Quote Originally Posted by Markus Keller View Post
    Those look like dryer slinkies,

    To me, they look like they are larger than 4", but nonetheless ...

    ... "dryer slinkies" are not even allowed to be used for dryers.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
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  12. #12
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    Cool Re: HVAC System

    Well, JP you ought to clarify you are allowed to use flexible 'transition ducts' on dryer vents if using the prescribed materials under the prescribed conditions but............

    Somebody tell me how you use a flexible transition duct and maintain a male-up pipe orientation? I've never seen a flex hose that was sized to slip inside a rigid pipe that didn't downsize the duct.

    Keep the fire in the fireplace.

  13. #13
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    Default Re: HVAC System

    Quote Originally Posted by Bob Harper View Post
    Well, JP you ought to clarify you are allowed to use flexible 'transition ducts' on dryer vents if using the prescribed materials under the prescribed conditions but............

    Somebody tell me how you use a flexible transition duct and maintain a male-up pipe orientation? I've never seen a flex hose that was sized to slip inside a rigid pipe that didn't downsize the duct.
    Those little blue pills might help with rigidity...

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  14. #14
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    Default Re: HVAC System

    Are you sure those are heat ducts and not return air ducts?

    MinnesotaHomeInspectors.com
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  15. #15
    mathew stouffer's Avatar
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    Default Re: HVAC System

    A contractor evaluated it and said it was fine, just cheap. I asked him about the duct sized and lack of insulation and he could have cared less. Then the buyer was there and asked how much to improve it and he said 1000 to 1500. Glad I said something about it, I don't want to pay for it


  16. #16
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    Default Re: HVAC System

    Quote Originally Posted by Bob Harper View Post
    Well, JP you ought to clarify you are allowed to use flexible 'transition ducts' on dryer vents if using the prescribed materials under the prescribed conditions but............

    Bob,

    Except those slinkies *are not* approved for use as transition duct (dryer connectors) - neither the foil types nor the plastic ones, ONLY the flexible metal ones.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  17. #17
    ray jackson's Avatar
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    Default Re: HVAC System

    What state is that in? In CA code is a minimum R-4.2. As far as that furnace being in the envelope, it doesn't appear to be. I'm not sure what contractor would say that was O.K. If you measured the external static pressure (ESP) I'm sure it would be far outside the capability of the blower. Just a drastic loss in capacity for the system, but hey, if the home owner wants to run a 5 ton A/C to get 4 tons of cooling, good for him.


  18. #18
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    Default Re: HVAC System

    If the installation is in an unheated space you better check the water piping and water softener too.


  19. #19
    Mark Aakjar's Avatar
    Mark Aakjar Guest

    Default Re: HVAC System

    There is also a loss in thermal efficiency here. In New Jersey all branch ducts in new construction must be minimum of R-6


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