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Posted by Wayne Boatwright on October 2, 2009, 6:19 pm
On Fri 02 Oct 2009 11:10:46a, Alfred K. told us...
>> 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.
If the duct is sealed to the exhaust fan outlet, I can't imagine how dust
would enter the system from the attic. You could, of course, seal all
perceptible joints, corners, screw holes, etc., on the housing with duct
tape.
We had a similar installation in a previous house with similar insulation.
Nothing additional was required and we had no problem.
--
~~ 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, 10:05 pm
> On Fri 02 Oct 2009 11:10:46a, Alfred K. told us...
>>> 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.
> If the duct is sealed to the exhaust fan outlet, I can't imagine how dust
> would enter the system from the attic. You could, of course, seal all
> perceptible joints, corners, screw holes, etc., on the housing with duct
> tape.
> We had a similar installation in a previous house with similar insulation.
> Nothing additional was required and we had no problem.
Was it in the area with very hot summers? I am thinking of potential
overheating if the fan housing is sitting deep in the cellulose without
any air gap surrounding it.
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Posted by BQ340 on October 2, 2009, 10:17 pm
Alfred K. wrote:
>> On Fri 02 Oct 2009 11:10:46a, Alfred K. told us...
>>>> 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.
>> If the duct is sealed to the exhaust fan outlet, I can't imagine how
>> dust would enter the system from the attic. You could, of course,
>> seal all perceptible joints, corners, screw holes, etc., on the
>> housing with duct tape.
>> We had a similar installation in a previous house with similar
>> insulation. Nothing additional was required and we had no problem.
>
> Was it in the area with very hot summers? I am thinking of potential
> overheating if the fan housing is sitting deep in the cellulose without
> any air gap surrounding it.
>
>
The motor is cooled by the airflow
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Posted by Wayne Boatwright on October 2, 2009, 10:39 pm
On Fri 02 Oct 2009 07:05:45p, Alfred K. told us...
>> On Fri 02 Oct 2009 11:10:46a, Alfred K. told us...
>>>> 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.
>> If the duct is sealed to the exhaust fan outlet, I can't imagine how
>> dust would enter the system from the attic. You could, of course, seal
>> all perceptible joints, corners, screw holes, etc., on the housing with
>> duct tape.
>> We had a similar installation in a previous house with similar
>> insulation. Nothing additional was required and we had no problem.
>
> Was it in the area with very hot summers? I am thinking of potential
> overheating if the fan housing is sitting deep in the cellulose without
> any air gap surrounding it.
>
>
>
Yes, very hot but not humid. No problems at all. A lot depends on the
quality of equipment you buy.
--
~~ 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 ransley on October 2, 2009, 6:53 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?
Vent moist air into an attic and it will be black with mold fairly
quickly. Then follows rot, vent it as they all are supposed to be
done, outside.
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