Product review (1 stars): Crap.
Lint flew all over the room the washer and dryer is in. And you expect me to fill this thing onthe regular!? Well, we paid $300 to get a pipe fished across the ceiking to the other end of the wall (where the damn exhaust could go because of course the washer/dryer hookups are on the opposite end of the hallway) and new hole (in the side of the house) installed. Now THAT works.

I totally DO NOT recommend this for another reason! Some people like the extra moisture but it was making the (freshly painted) paint in our hallway bubble and peel. Not to mention mold was just around the corner.