Quote:
Originally Posted by MandoMan
Ideally, the vent flap is weighted so it just barely closes when the fan isn’t on. Way less than the weight of a dime. That makes it easier for the fan to blow it open. If a slight suction is caused by a wind blowing past the opening on the roof, it may open. I’ve seen this on a number of houses. You might be able to fix it by turning the pipe on the roof ninety degrees, if that is possible. It might be at a fixed angle, though. Most are, I think.
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Correct. But, most of the newer houses have the bathroom exhaust outlet in the soffit. The vent flap noise may be annoying to some people, but it is not considered a design or construction defect. If I wanted to stop the noise, I would install some type of diverter on the soffit to redirect the wind and prevent the suction in the duct. I have never seen this done, but it seems like another way to stop the noise other than altering the vent flap above the bathroom ceiling, which could prevent the vent flap from functioning properly.