Product review (2 stars): not very practical.
The switch (black thing) does not split open to go over the dryer wires.  Will have to open the dryer wires and slide this in and then its too large anyway and doesn't fit in the dryer junction box.  I think I have to let it go and just use the fan only.  The fan looks great and I think it will work great.  The switch is an issue.  not very practical.