I would bet the hole is too long to be covered by a fan. Why not just change out your regular bath fan for a Fantastic or Maxx air fan?
We ordered our 16 mS with The fully adjustable fan in the bedroom and above pantry in kitchen area plus the bathroom with speed control
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2015 RAM LongHorn Dually Air ride Aisin 4:10's
2016 MS 39TKSB3 "Highly Elited"
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