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We have two bathrooms side by side on our second floor. They both have the same exact layout (about 6'x7'). Both have their own separate exhaust fans (Nutone, 80CFM, 1.6amps), but share the same vent to the roof through a Y-shaped connector and flex 4" pipe. When we take steamy showers in bathroom A, paint from the ceiling of bathroom B is showing signs of moisture and paint is peeling in one area of the ceiling. We even noticed some condensation on the tile wall of bathroom B.

What could be causing the problem in bathroom B and how can we fix it?
 

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Welcome to the forum, Advice above plus, the internal baffles in a bath fan often do not provide a 100% closure.

The peeling paint raises the issue that something else is wrong as that takes a lot of moisture. Inspect the "Y" and all ducts.

What is your climate zone and how long has this been going on? When was that bathroom painted?

Bud
 
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