Product review (5 stars): Gets your humidity up FAST when you put these in !!!
I didn't realize how fast the humidity goes up after having the old ones in for 2 seasons. One word of caution.........remember how you took it apart so you don't have to agonize on how to get it together again. Installing the Filters was EASY, putting all the other parts back was a tad troublesome until I pulled the book out. SO........remember what goes where, there aren't that many parts but I got the front and back reversed and it doesn't work that way. Human error not mechanical  :-)