higher speed bathroom fans?

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Old 09-03-15, 09:38 PM
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higher speed bathroom fans?

My home is situated above parellel 66, very cold in winter. I have water stains on both my bathroom ceiling. One bathroom vent is 6 ' in length the other is 12 feet in length. I was told that i need to replace my current 110 CFM vent fan out to higher speed to expel the warm air at a faster rate to prevent condensation. Any suggestionsand advice are very much appreciated. Thanks
 
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Old 09-03-15, 11:14 PM
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I was told that i need to replace my current 110 CFM vent fan out to higher speed to expel the warm air at a faster rate to prevent condensation.
Stop and think about that. If you expel more warm air you'll get more condensation.

You get condensation when the warm air hits the cold duct. You need to use fully insulated ductwork. It's also important that the outside damper be working properly.
 
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Old 09-04-15, 05:35 AM
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Just shop for a higher volume fan. Higher quality fans with higher cfm output also tend to be quieter.

One thing to watch out for since you are so far north and your home may be very tight. Whatever the fan blows out the same amount of outside air must enter the home. If your house is very tight even the best fan will not work well unless outside air can somehow enter the home.
 
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Old 09-04-15, 06:02 AM
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I agree with PJ and PD, but want to add some thoughts.
What is above the bathroom. attic or another floor? Can you access those ducts?

Are the stains from water forming inside the ducts and leaking out somewhere or are they from condensation surrounding the ducts due to an air leak?

Another source could be shutting the fan off too soon and leaving the duct and bathroom full of excess moisture. They make special switches that stay on for 20 minutes (adjustable) after you switch it off and leave the room.

Bud
 
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