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Old 08-01-2010, 12:18 PM   #1
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duct moisture


I found one of my flex supply ducts has water on it, enough that it accumulates and drips off. Don't know how long this has been happening.

What are the potential causes? I don't have much access to the duct work(no attic) but am trying to find out if this is happening in other areas. There is no moisture on the main trunk as it exits the unit, nor on the 2 short supplies off the main in the HVAC closet.

Thanks for comments and opinions.

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Old 08-01-2010, 02:50 PM   #2
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duct moisture


Is there an air leak near the area where the moisture is? If so, thats your cause.

Could also be the insulation in that area of the flex is damaged or missing.

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Old 08-01-2010, 05:24 PM   #3
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duct moisture


I am checking for leaks, but this is a tight spot. From what I can see, the insulation is good.
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Old 08-01-2010, 06:06 PM   #4
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duct moisture


A small air leak is all it takes.
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Old 08-02-2010, 07:20 AM   #5
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duct moisture


What ways can I check for a leak? I can't get to the area where the flex is tied into the trunk without tearing out drywall. I would like to avoid that if possible.
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Old 08-02-2010, 07:30 AM   #6
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duct moisture


The air leak would be very near to the area that has the condensation.

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