Product review (4 stars): INSTALLED IT IN A TOWNHOUSE
I installed this unit in the attic of a two story townhouse and then discovered my dryer was not blowing hard enough to trigger the pressure switch to make it turn on.  So I re-mounted it directly behind the dryer.  Now it functions properly but it is not producing as much pressure at the exterior vent as I would like to see.  I was considering buying another unit to put in the attic but I now see they have jacked up the price on these boosters.  So forget that.  I am sure what I have is an improvement but I have yet to see how it effects drying time.