Product review (5 stars): Best investment I have made in a long time.
We have two dryers in our basement washroom and one vent.  The vent goes up 10 through the wall to vent to the outside.  Dryer before the booster kept saying check vent.  With this unit, it automatically turns on with air pressure from the dryer and off when it is done.  Wonderful.  Have not had a check vent light since.  My vent lines are also much cleaner and the lint does not clog up anymore.