Product review (4 stars): A handy way to save energy
This device is very easy to install, however, you're better off using a metal clamp than the included plastic ones.  As others have said, the included screen is terrible for filtering.  Use an old piece of nylon stocking instead.  Do not use it in a small, enclosed room as the increased moisture will coat everything in condensation.  Either wait 5-10 minutes for much of the moisture to exit the house, or open the door to your laundry room.