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Posted by Lacustral on June 5, 2006, 6:14 pm
I have a little bathroom, I want to have the most powerful fan in there
that I can, without obviously overdoing it - like having a lot of wind in
there! I'd put an inline fan in the attic. I'm not sure how much would
be too much. I'd like it to double as house ventilation, to empty the hot
air out of my house overnight, that's why I want a fan more powerful than
the minimum.
If you have a powerful bathroom fan, and it's too powerful, can you tell
me its CFM and what the square footage of your bathroom is?
Or, if you have a powerful bathroom fan, and it's NOT too powerful, same
thing? So I can get a ballpark idea of how much power is too much.
I could put a variable speed control on the fan, Fantech's inline fans
take a variable speed control that goes from 0-100% - so I
could put in a bathroom fan that's too powerful for the bathroom, and
use it dialed down when it's being used just for bathroom
ventilation. I guess - I don't know if there are hitches in that idea.
Thanks.
Laura
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Posted by PipeDown on June 5, 2006, 6:50 pm
If you try to use the bath fan for whole house ventilation, you will have a
problem in the winter when you want to get rid of steam and smell cause the
window is closed and you end up exhausting all that air in the rest of the
house you just paid to heat up.
I think a timer and thermostat would result in more efficiency than a
thermostatic control only. Consider the thermal mass of the house and
contents. If you wait for a thermostat to demand the fan, the whole house
will be hot when it comes on and it will take longer to cool as the
furnature and walls are hot as well as the air.
With a timer, you can set it to run into the evening pulling in cool night
air and cooling the contents, then turn it off in the morning to keep that
cool ari inside as the air outside warms up, then at the right time, turn
the fan on to prevent the inside air from warming above the outside air temp
>I have a little bathroom, I want to have the most powerful fan in there
> that I can, without obviously overdoing it - like having a lot of wind in
> there! I'd put an inline fan in the attic. I'm not sure how much would
> be too much. I'd like it to double as house ventilation, to empty the hot
> air out of my house overnight, that's why I want a fan more powerful than
> the minimum.
>
> If you have a powerful bathroom fan, and it's too powerful, can you tell
> me its CFM and what the square footage of your bathroom is?
>
> Or, if you have a powerful bathroom fan, and it's NOT too powerful, same
> thing? So I can get a ballpark idea of how much power is too much.
>
> I could put a variable speed control on the fan, Fantech's inline fans
> take a variable speed control that goes from 0-100% - so I
> could put in a bathroom fan that's too powerful for the bathroom, and
> use it dialed down when it's being used just for bathroom
> ventilation. I guess - I don't know if there are hitches in that idea.
>
> Thanks.
> Laura
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Posted by on June 6, 2006, 10:05 am
PipeDown wrote:
> If you try to use the bath fan for whole house ventilation, you will have a
> problem in the winter when you want to get rid of steam and smell cause the
> window is closed and you end up exhausting all that air in the rest of the
> house you just paid to heat up.
>
>
I agree with Pipedown. I doubt a bath fan in a small bathroom can be
practical and serve as both a bath fan and also a whole house fan. To
move air through the entire house requires an order of magnitude more
air flow than a bath fan. One properly sized for one use isn't going
to be much good at all at the other.
As for bathroom fan capacity, the ballpark estimate for small to med
size bathrooms is 1 CFM for every sq ft of floor space.
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Posted by Bobk207 on June 6, 2006, 9:30 pm
Lacustral wrote:
> I have a little bathroom, I want to have the most powerful fan in there
> that I can, without obviously overdoing it - like having a lot of wind in
> there! I'd put an inline fan in the attic. I'm not sure how much would
> be too much. I'd like it to double as house ventilation, to empty the hot
> air out of my house overnight, that's why I want a fan more powerful than
> the minimum.
>
> If you have a powerful bathroom fan, and it's too powerful, can you tell
> me its CFM and what the square footage of your bathroom is?
>
> Or, if you have a powerful bathroom fan, and it's NOT too powerful, same
> thing? So I can get a ballpark idea of how much power is too much.
>
> I could put a variable speed control on the fan, Fantech's inline fans
> take a variable speed control that goes from 0-100% - so I
> could put in a bathroom fan that's too powerful for the bathroom, and
> use it dialed down when it's being used just for bathroom
> ventilation. I guess - I don't know if there are hitches in that idea.
>
> Thanks.
> Laura
Laura-
Bathroom fans serve the purpose of odor & mositure control. The
suggestion of 1 CFM per square foot of bathroom area is a good one.
Sizing an attic fan / whole house ventilator uses the same rule of
thumb but results is a whole different animal!
Even a small house (1500 sq ft) would suggest a 12,000 CFM fan
.........about 100 times the capacity of the fan for a large
bathroom.
I have "cheated" & used a 20" box fan jammed in a window as a "poor
man's" whole house fan......not the "correct" solution but if you get
good night time temperature drop where you live, it will do the job and
cost peanuts.
A 20" box has about 2000 cfm......now you're only off by a factor of 6
or so not 100! Use two 20" fans & your even closer.
cheers
Bob
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Posted by on June 7, 2006, 5:03 am
>Even a small house (1500 sq ft) would suggest a 12,000 CFM fan...
"Hello. I am your small house. I suggest a 12,000 CFM fan."
Nick
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