Product review (5 stars): Excellent & Durable For YEARS!
I cannot say enough good things about this product.  Both I, and my brother-in-law, have had this vent closure installed on our homes for several years with no complaints whatsoever.  I find it hard to believe some of the things said by two other reviewers.

One says the vent makes a mess - uh, DUH!  Your dryer is making the mess, not the vent closure.  Your dryer's filter screen lets a lot escape, and so it exits the vent closure as it should!  If it didn't escape it would clog the vent and cause a dryer fire as air flow is strangled causing temperature to rise in the line.

Another reviewer wrote a book about his brick problems, even complaining about having to use caulking.  He also said it HAD to be painted to prevent ultra violet light damage.  Well, if caulk is a problem then let it leak air.  The heat loss will equal the cost of a case of caulk in short order, but that is the alternative.  As for HAVING to paint it, nothing could be further from the truth!  Mine, and my brother-in-law's,  have been unpainted for many years now with no signs of brittleness yet.  But, if you want to paint it, that should take a whopping 15 minutes.  Geez, a complainer in every crowd, I guess!

My vent closure has eliminated cold air from entering the laundry room!  Opening our dryer door used to feel like opening a freezer door.  Our feet would turn to ice in that room until I installed this vent closure!!  And the floating cup, despite lint build-up, has maintained a tight air, bug & rodent-proof seal when the dryer is not running.  It cleans easily if you have even the slightest mechanical skills.

In my opinion, this product will pay for itself in home heating and cooling costs in less than one season while keeping out rodents and insects.  Don't let the naysayers seize the day!!!