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Subject Author Date
Insulating Exhaust Fan Conduit Vince 06-27-2005
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Posted by Vince on June 27, 2005, 8:06 pm

Any thoughts / experience with insulating material for a 4 inch
diamter tubing used in a bathroom exhaust fan installation? The
tubing shall be in an attic crawl space in a ranch style house located
on Long Island, NY (typical low and high temperatrures: 0F and 100F
degrees).

I am wondering if pipe insulation or batt fiberglass insualtion should
be used in this application ?

Is Owens-Corning Fiberglass Duct Wrap
http://www.owenscorning.com/comminsul/documents/FiberglasAll-ServiceDuct.pdfappropriate
appropriate material for this application ?




Posted by RBM on June 27, 2005, 8:11 pm
I don't know what you purpose for wrapping is, but you may be able to buy
4inch insulated flex duct. If its for noise, I'd just get a really quiet
exhaust fan
>
> Any thoughts / experience with insulating material for a 4 inch
> diamter tubing used in a bathroom exhaust fan installation? The
> tubing shall be in an attic crawl space in a ranch style house located
> on Long Island, NY (typical low and high temperatrures: 0F and 100F
> degrees).
>
> I am wondering if pipe insulation or batt fiberglass insualtion should
> be used in this application ?
>
> Is Owens-Corning Fiberglass Duct Wrap
>
http://www.owenscorning.com/comminsul/documents/FiberglasAll-ServiceDuct.pdfappropriate
> appropriate material for this application ?
>
>
>



Posted by Vince on June 27, 2005, 8:17 pm

I am concerned that condensation might develop within the attic crawl
space and cause damage to other insulation material.

I have read here in this NG and elsewhere that it is important to
insulate the tubing conduit from the expected cold temperature that is
present in the attic crawlspace and not to simply vent the fan's moist
exhaust air into the attic space. .

On Mon, 27 Jun 2005 20:11:04 -0400, "RBM" <rbm2(remove
this)@optonline.net> wrote:

>I don't know what you purpose for wrapping is, but you may be able to buy
>4inch insulated flex duct. If its for noise, I'd just get a really quiet
>exhaust fan

Posted by Luke on June 27, 2005, 9:03 pm
wrote:

>I am concerned that condensation might develop within the attic crawl
>space and cause damage to other insulation material.
>
>I have read here in this NG and elsewhere that it is important to
>insulate the tubing conduit from the expected cold temperature that is
>present in the attic crawlspace and not to simply vent the fan's moist
>exhaust air into the attic space.
[snip bottom quote]

If you exhaust *into* the attic, insulation will just help trap the
moisture you're putting up there. Exhaust *through* the attic to the
*outside*, through a wall or through the roof, i.e, run the duct to
the outside. Slight leakage from duct joints won't amount to much, but
if that concerns you, wrap the joints with aluminum tape. It won't
hurt to wrap the duct with fiberglass wrap, but probably won't
accomplish much either.

--
Luke
___________________________________________________________________
"The best time to invest is when there is still blood on the
ground."
-- Delegate at ReBuilding Iraq 2 trade show, Sheraton Hotel,
Arlington, VA, December 3-4, 2003

Posted by Bob M on September 9, 2005, 8:39 pm

> After the last one had me going, I can't wait to see how this one
> transpires..
> Searcher
>
The last one In retrospect dumping the salt OUT OF the bags into wheel
barrow ( clean) spreading around the pool with shovel might of been a better
idea, to bad I didn't think of that.



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