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Could be that the repair isn't well sealed to the roof, allowing water to come down the outside of the vent pipe. Or the spring loaded flap that's supposed to seal it when the exhaust fan isn't on is not closing properly... either because it's a cheap piece of junk or it is damaged. You may be able to spot the second possibility with binoculars, etc from ...


Any leak can rot the building, ruin insulation, cause electrical shorts, and cause mold. Water and any part of houses other than the inside of the plumbing don't mix, in general. Since this is the bathroom fan vent, you have immediate potential for electrical/water interaction.

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