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rjv62
condesation found in duct work

I found about 10 oz of condestion in a 6" flex duct. Had this problem once before in the master bath about 5 years ago. No smell of mold. When I first start up the ac in the summer I get a stale smell but then goes away. Attic has a roof fan and is well vetilated. Why the condensation build up?

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