Product review (5 stars): These are easily cleaned, easy to install and work great
I have installed 3 of these over the years. They are mouse proof, and prevent cold winter air from entering your dryer.
The cheap old school flapper type vents are only effective until a small amount of lint collects around the flapper door, then it will never close completely.
These are easily cleaned, easy to install and work great. Simply remove the outside part of your old vent (leave everything else in place) and then attach over the existing hole. This requires a couple of screw to be held in place from the outside.
I used some sealer to seal this to the brick on my house. 10-15 minute installation.