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Insulated ducts - Page 2

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Posted by Charlie on January 3, 2009, 1:42 am
 
Father Haskell wrote:

I was thinking about a large air duct (out of the weather).

For 4" & only a few feet long, I'd think about single wall stove pipe
(or rigid dryer duct) inside 6" or 8" aluminum or galvanized central
heat/ac duct & foam the gap with Great Stuff or latex foam.

Same trick could be done with plastic drain pipes. I've got some PVC
pipe that's been laying out in the sun for almost 10 years & it's still
relatively strong. I wouldn't try high pressure water in it, but a few
psi of air wouldn't worry me at all.

Charlie

Posted by Father Haskell on January 3, 2009, 9:20 pm
 

That'd work.


FWIW, high pressure water is used to test pipes or
tanks because liquids are incompressible.  Should the
vessel start to fail, the pressure immediately drops to
zero.

Posted by Zyp on January 8, 2009, 1:09 am
 Father Haskell wrote:

Why not use the same thing the HVAC people use?  A product called c-lined
duct.  [circle-lined] duct.  It is basically sheet metal duct with
fiberglass insulation on the interior.  The interior fiberglass is coated
with a backing to prevent the air from picking up stray fibers. Its been in
the industry for ---- I don't know, 60 years.  If you need an interior
diameter of 4", then you want 6/4 circle-lined duct.  You're welcome.

--
Zyp



Posted by Father Haskell on January 9, 2009, 4:25 am
 
Thanks.

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