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Posted by on February 4, 2007, 9:38 pm
> On Feb 4, 7:55 pm, you...@comcast.net wrote:
>
>
>
>
>
> > I've been trying to find an answer to this problem for over 2 weeks
> > now.
>
> > Here is the situation:
>
> > 2 newly installed panasonic 80 cfm bathroom exhaust fans(the kind that
> > fit in a 2x4 joist space) in two different bathrooms. These fans have
> > their own internal flapper.
>
> > Bathroom 1: 8 x 4 x 8
> > Bathroom 2: 8 x 5 x 8
>
> > I'm using 3" sheet meal ducting(the kind you have to "snap" together)
> > going horizontally out the side walls instead of going straight out
> > the roof. They duct out to exhaust hoods which also have a flapper on
> > them. I also have put insulation on the whole duct run.(not tried
> > putting insulation on the fan housing yet due to mold concerns.)
> > The duct runs are about 4' each from the exhaust fan and slope
> > downward from the start of exhaust fan to the wall, so you would think
> > condensation would just drip out towards the wall. You can go outside
> > while the fan is running and seems like its pushing out plently of
> > air. The fans are mounted in between the shower and the vanity right
> > above the toilet. The are mounted at a downward angle since the
> > sheetrock ceiling has a downward shape that matches my open beam
> > ceiling slope patter.
> > My whole house is all open bean ceilings, there is no attic. The duct
> > run is made above newly installed sheetrock and the open beam
> > ceilings, with a 4" space between the sheetrock and the open beam
> > ceiling. My open beam ceilings are vaulted going downward towards the
> > side wall, so the ducting runs down the similar open beam downward
> > slope. The ducting is not bent at all in the larger of the bathrooms,
> > and has a slight bend in the smaller of the two bathrooms going out
> > the side wall.
> > When I take a shower in the smaller of the two bathrooms, after about
> > 5-6 minutes, condensation starts leaking from the fan housing thru the
> > grille. I thought it was due to it being pretty cold outside, but
> > today was fairly warmer and the same results happended.
> > In the larger of the two bathrooms, it takes slightly longer to
> > condensate when taking a hot shower since its a bigger room, but it
> > happens in that bathroom as well.
>
> > Can anyone shed some light as to how I should go about solving this
> > issue, as I am out of ideas.
>
> > thanks,
> > Isaac
>
> Every output needs an input. You need an air makeup grill in the wall,
> door or wherever. The makeup air can come from any house area that is
> dryer than the bath. You will be amazed at how much more output your
> fans will have and I doubt you will see any more condensation.
> Reminds me of the many times I've seen techs fight a wiring problem in
> a car for hours only to find after all the struggle that it was a
> problem in the ground, not the positive side. Remember moving air goes
> in circuits, too. HTH
>
> Joe- Hide quoted text -
>
> - Show quoted text -
So you don't think its too cold in the space between open beam celing
and sheetrock?
The one thing I did which made it not leak at all, was to leave a
space heater on while taking a shower....the fan did operate much
better not even letting the bathroom mirror to fog up. So in this case
your theory proves correct except it wasn't just any air....it was
WARM air I was adding into the bathroom. Any thoughts about this as
well?
thanks so much for the prompt response
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