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Posted by Alfred K. on October 2, 2009, 12:36 am
An exhaust fan has been added to the upper floor bathroom. The attic's
insulation (cold climate!) is blown cellulose particles. Is it
customary to cover the fan's top housing with some kind of a cap to
protect it from being contaminated with the insulation dust?
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Posted by Tony Hwang on October 2, 2009, 12:46 am
Alfred K. wrote:
> An exhaust fan has been added to the upper floor bathroom. The attic's
> insulation (cold climate!) is blown cellulose particles. Is it customary
> to cover the fan's top housing with some kind of a cap to protect it
> from being contaminated with the insulation dust?
>
>
Hi,
The exhausted air should go outside thru insulated duct. How come are
you worried about dust?
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Posted by Wayne Boatwright on October 2, 2009, 1:19 am
On Thu 01 Oct 2009 09:36:50p, Alfred K. told us...
> An exhaust fan has been added to the upper floor bathroom. The attic's
> insulation (cold climate!) is blown cellulose particles. Is it
> customary to cover the fan's top housing with some kind of a cap to
> protect it from being contaminated with the insulation dust?
You should *not* be exhausting bathroom air directly into the attic. There
should be a duct (preferably insulated) connected to the exhaust fan and
connected to an appropriate exterior vent through the roof, eave, or sidewall
of the house. This would also apply to exhaust fans anywhere in the house;
e.g., utility room, kitchen, etc.
--
~~ If there's a nit to pick, some nitwit will pick it. ~~
~~ A mind is a terrible thing to lose. ~~
**********************************************************
Wayne Boatwright
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Posted by Alfred K. on October 2, 2009, 2:10 pm
> On Thu 01 Oct 2009 09:36:50p, Alfred K. told us...
>> An exhaust fan has been added to the upper floor bathroom. The attic's
>> insulation (cold climate!) is blown cellulose particles. Is it
>> customary to cover the fan's top housing with some kind of a cap to
>> protect it from being contaminated with the insulation dust?
> You should *not* be exhausting bathroom air directly into the attic. There
> should be a duct (preferably insulated) connected to the exhaust fan and
> connected to an appropriate exterior vent through the roof, eave, or sidewall
> of the house. This would also apply to exhaust fans anywhere in the house;
> e.g., utility room, kitchen, etc.
An insulated duct, of course, is there, connected to an ridge vent on
the roof. I am asking about some possibility of contamination even with
the duct present.
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Posted by EXT on October 2, 2009, 3:33 pm
> > On Thu 01 Oct 2009 09:36:50p, Alfred K. told us...
> > > An exhaust fan has been added to the upper floor bathroom. The
> > > attic's insulation (cold climate!) is blown cellulose particles.
> > > Is it customary to cover the fan's top housing with some kind of
> > > a cap to protect it from being contaminated with the insulation
> > > dust?
> > You should *not* be exhausting bathroom air directly into the
> > attic. There should be a duct (preferably insulated) connected to
> > the exhaust fan and connected to an appropriate exterior vent
> > through the roof, eave, or sidewall of the house. This would also
> > apply to exhaust fans anywhere in the house; e.g., utility room,
> > kitchen, etc.
> An insulated duct, of course, is there, connected to an ridge vent on
> the roof. I am asking about some possibility of contamination even
> with the duct present.
No, you won't get contamination. However, I find it actually contrary to the
building code in regards to vapor barrier sealing, that most manufacturers,
even high priced ones, have many holes, opening, gaps and other areas that
water vapor and drafts can easily get through. When I install such fans, I
always cover every hole, opening and joint with metalic duct tape on the
inside and outside of the housing. This gets as close as possible to a good
vapor barrier and prevents the fan's vacuum from pulling insulation dust
into the housing and drafts from entering when the fan is off.
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> insulation (cold climate!) is blown cellulose particles. Is it customary
> to cover the fan's top housing with some kind of a cap to protect it
> from being contaminated with the insulation dust?
>
>