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Exhaust fans and attic ventilation questions ChrisW 06-27-2007
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Posted by ChrisW on June 27, 2007, 9:56 pm
Presently, my two bathrooms have exhaust fans venting straight into
the roof attic space. I do not believe that my roof has any
ventilation system at all. I am concerned that this may promote
unhealthy air which filters down into the living areas below. Are
these concerns valid?

I am considering installing ducted versions of the exhausts fans which
exhaust air outside through the roof. Or I could install a draught
stopper version of the exhaust fan to prevent air from coming down
from the roof. I would also like to install some sort of roofing
ventilation like those twirling whirlybird ventilators. Would these
address the issues above?

Chris


Posted by on June 27, 2007, 10:40 pm

>Presently, my two bathrooms have exhaust fans venting straight into
>the roof attic space. I do not believe that my roof has any
>ventilation system at all. I am concerned that this may promote
>unhealthy air which filters down into the living areas below. Are
>these concerns valid?

        Only if you actually turn the fans on. Or if you don't have
them blocked to prevent drafting.

>
>I am considering installing ducted versions of the exhausts fans which
>exhaust air outside through the roof. Or I could install a draught
>stopper version of the exhaust fan to prevent air from coming down
>from the roof. I would also like to install some sort of roofing
>ventilation like those twirling whirlybird ventilators. Would these
>address the issues above?
>
>Chris

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Posted by Jeffrey Lebowski on June 27, 2007, 11:55 pm

> Presently, my two bathrooms have exhaust fans venting straight into
> the roof attic space. I do not believe that my roof has any
> ventilation system at all. I am concerned that this may promote
> unhealthy air which filters down into the living areas below. Are
> these concerns valid?
>
> I am considering installing ducted versions of the exhausts fans which
> exhaust air outside through the roof. Or I could install a draught
> stopper version of the exhaust fan to prevent air from coming down
> from the roof. I would also like to install some sort of roofing
> ventilation like those twirling whirlybird ventilators. Would these
> address the issues above?
>

I say go for the twirling whirlybirds.

--




Posted by CJT on June 28, 2007, 5:33 pm
Jeffrey Lebowski wrote:

>
>>Presently, my two bathrooms have exhaust fans venting straight into
>>the roof attic space. I do not believe that my roof has any
>>ventilation system at all. I am concerned that this may promote
>>unhealthy air which filters down into the living areas below. Are
>>these concerns valid?
>>
>>I am considering installing ducted versions of the exhausts fans which
>>exhaust air outside through the roof. Or I could install a draught
>>stopper version of the exhaust fan to prevent air from coming down
>>from the roof. I would also like to install some sort of roofing
>>ventilation like those twirling whirlybird ventilators. Would these
>>address the issues above?
>>
>
>
> I say go for the twirling whirlybirds.

I think those are pretty worthless.

>
> --
>
>
>


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Posted by Abby Normal on June 28, 2007, 8:57 am
I would vent the fans to the outside, not let them blow in the attic.

Venting attics is for cold climates, to stop ice dams. Other areas
need to be sealing the attics and keeping the heat out. We need to
change how we build.

> Presently, my two bathrooms have exhaust fans venting straight into
> the roof attic space. I do not believe that my roof has any
> ventilation system at all. I am concerned that this may promote
> unhealthy air which filters down into the living areas below. Are
> these concerns valid?
>
> I am considering installing ducted versions of the exhausts fans which
> exhaust air outside through the roof. Or I could install a draught
> stopper version of the exhaust fan to prevent air from coming down
> from the roof. I would also like to install some sort of roofing
> ventilation like those twirling whirlybird ventilators. Would these
> address the issues above?
>
> Chris



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