The fan in our master bath was also keeping us awake. On our walk-through the rep said that some people had removed the damper entirely, however there were downsides to that such as drafts and small insects. She also confirmed that the vent does not discharge through the roof.
I opened the fan and added a small bit of weight to the damper. This all but stopped the tapping but didn't stop the damper from opening when the fan was turned on. I used a piece of the adhesive backed weight from the ceiling fan balancing kit.
This isn't elegant and the weight will probably fall off in time, but it works for now. If you try this fix, check the direction the damper opens so you get the weight in the right spot.
LED
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Jackie & Larry Duff
The Village of Hemingway
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