Product review (4 stars): Directions are weak, but product performs great!
We purchased the dryer jet, because of a tricky dryer set up in our home the exhaust has multiple 90 degree corners and a total length of about 25 feet.  Save yourself some frustration and upon receipt of the booster, go to the website and download a color copy of the directions.  It makes things much more clear!  The booster works great and decreased my drying time easily by 50%.