Bathroom Exhaust Fan Condensation Build-Up

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Old 03-15-09, 06:29 AM
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Bathroom Exhaust Fan Condensation Build-Up

Condensation is building up inside of the bathroom exhaust fan I replaced about 2 years ago. After a hot shower it drips water out from around the corner of the exhaust fan housing. It's ruining the bathroom ceiling.

Note: The exhaust fan is a small basic fan..there's no type of lighting fixture associated with it.

The only way to prevent dripping is to leave the bathroom door all the way open when I shower.

I'm not taking any longer nor hotter shower than usual, so I have no idea why it's just now doing this....

Any suggestions....?
 
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Old 03-15-09, 08:05 AM
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Hi!

Can you please provide us with the size of the fan (CFM) and the size of the bathroom?

Sounds like the fan is not strong enough.
 
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Old 03-15-09, 12:20 PM
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The bathroom is 6' x 9'.

I can't tell what the CFM is... It's a Broan Nutone fan; the only markings on the fan that are legible are "120V, 60hz".
The fan blade is 4.5" in diameter

The fan is pretty comparable to the one installed when the house was built in '81.
 
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Old 03-15-09, 12:28 PM
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If you have access..you may want to go up and look at the ducting. It may be uninsulated or blocked. Also take the cover off and clean the fan, lint and dust could have built up on the blades, lessening the air movement. Check the vent to make sure flaps or louvers are opening when the fan is on.

6 x 9 isn't huge, but its not small either...you could need a bigger fan.

Has it never done this before?
 
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Old 03-15-09, 02:41 PM
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No, the first 2+years I've had the fan I've never had this problem..and what's more odd is that I have the exact exhaust fan in my other bathroom (also 6'x9') and have had no problems with that one.
 
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Old 03-15-09, 03:00 PM
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Check the internal damper as well.

Oh...also make sure it is really drawing air it should be able to hold a tissue or paper towel up w/o any problem.

I saw and made a little carboard box flow tester one time...but I can't find the info anymore.
 
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