HVAC Engineering 101 - Question about heat loss through ductwork

Posted by Noon-Air on December 26, 2007, 5:45 pm

> On Tue, 25 Dec 2007 14:03:24 -0800, a variety of posters wrote:
> Thanks for all the info.
> One last question: I noticed that the metal adaptor/box (6" round to
> 4x10)at the end of the flex isn't insulated at all. Do these normally
> get wrapped with something ?

Did you look *inside* the box??

Posted by still just me on January 1, 2008, 12:32 pm

wrote:

>> One last question: I noticed that the metal adaptor/box (6" round to
>> 4x10)at the end of the flex isn't insulated at all. Do these normally
>> get wrapped with something ?

>Did you look *inside* the box??

Nothing in there... plain sheet metal, in and out.

Posted by Noon-Air on January 1, 2008, 12:53 pm

> wrote:

>>> One last question: I noticed that the metal adaptor/box (6" round to
>>> 4x10)at the end of the flex isn't insulated at all. Do these normally
>>> get wrapped with something ?

>>Did you look *inside* the box??

> Nothing in there... plain sheet metal, in and out.

<sigh> I hate it when the cheapest crap gets installed by the lowest bidder.

*EVERY* boot that I have seen and/or installed in this neck of the woods are
insulated internally with 3/4 inch black faced wool or fiberglass. If the
box is not insulated internally, then it will need to be wrapped, otherwise
just as soon as the air temp inside the ducts drops below dew point, your
gonna have a mess.

Personally, I will not install flex or ductboard *PERIOD*.

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