Product review (5 stars): Indoor dryer vent
This product was perfect for my application.  I needed an indoor application since an external would have been too long.  This uses water in the bottom half of it and the hot air escapes though the top half.  No lint is flying from top as other reviews state.  My dryer is located in a basement laundry room and I do notice humidity levels will rise but not to an extent of uncomfortable.  It is easy to empty and reattach.