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Insulation for 4" exhaust fan duct - available? Lee 06-21-2005
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Posted by Lee on June 21, 2005, 10:28 pm
I'm installing a bathroom exhaust fan, and I want to insulate the exhaust
duct. I'm planning to use 4" solid exhaust duct. Where can I find
insulation for this 4" round duct?

Posted by New & Improved - N/F John on June 21, 2005, 11:19 pm
You can find fiberglass pipe wrap at the big boxes or probably a True Value
or Sentry. My concern was the effectiveness of the flaps.

> I'm installing a bathroom exhaust fan, and I want to insulate the exhaust
> duct. I'm planning to use 4" solid exhaust duct. Where can I find
> insulation for this 4" round duct?



Posted by HeatMan on June 22, 2005, 7:36 am

> I'm installing a bathroom exhaust fan, and I want to insulate the exhaust
> duct. I'm planning to use 4" solid exhaust duct. Where can I find
> insulation for this 4" round duct?.

Not to be a smart alec, but why do you want to insulate it?



Posted by Art Todesco on June 22, 2005, 9:03 am
In areas where it is very cold and the
pipe passes through an unheated
attic, condensation (or ice) can form on
the inside of the pipe. This happens
because the flap at the fan doesn't
usually close 100% and allows some
inside air to pass even when the fan is
off. If ice forms, it will eventually
melt and might probably drip from the
fan. I've had it happen.

HeatMan wrote:
>
>>I'm installing a bathroom exhaust fan, and I want to insulate the exhaust
>>duct. I'm planning to use 4" solid exhaust duct. Where can I find
>>insulation for this 4" round duct?.
>
>
> Not to be a smart alec, but why do you want to insulate it?
>
>

Posted by HeatMan on June 22, 2005, 6:48 pm
Okay, that makes sense. Around here, it doesn't get THAT cold....

> In areas where it is very cold and the
> pipe passes through an unheated
> attic, condensation (or ice) can form on
> the inside of the pipe. This happens
> because the flap at the fan doesn't
> usually close 100% and allows some
> inside air to pass even when the fan is
> off. If ice forms, it will eventually
> melt and might probably drip from the
> fan. I've had it happen.
>
> HeatMan wrote:
> >
> >>I'm installing a bathroom exhaust fan, and I want to insulate the
exhaust
> >>duct. I'm planning to use 4" solid exhaust duct. Where can I find
> >>insulation for this 4" round duct?.
> >
> >
> > Not to be a smart alec, but why do you want to insulate it?
> >
> >



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