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That photo says it all. Even with the fan off, warm damp air will float up into the pipe due to the chimney stack effect and then cool and condense. Then there's nowhere for it to go.
Bathroom Fan - condensation in pipe
- Thread starter AndyPRK
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Maybe I should put the pipe outlet by the eves
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Eave's would help, changing the vast majority of the pipe to rigid smooth pipe would help, then the water wouldn't pool and could evaporate again, and give a slight fall to outside and make sure any water running down can safely exit the terminal, so use sealant to make the connections.
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