Retiredguy beat me, I agree with his reply. I will add if you partially take the fan apart you may be able put a small piece of foam between the flapper and the fan housing. Also, there are probably several different varieties of fans in the villages houses so you will probably need to look at your fan to see what might work.
One other point, our house is so tight that we rarely hear any tapping from our fans, so is it possible you have a leak at your house? This could be leaving the dryer door open, a pet door, any loose-fitting window or slider, etc.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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