Product review (5 stars): Wow.  What a difference....
I had the typical builder grade plastic louver vent on my dryer exhaust.  The side of my house where the vent is gets blasted by wind.  During the winter my vent would actually freeze inside my house.  I have a direct vent with a steel pipe connected to my dryer.  It would frost up and if you opened the dryer door you got a blast of cold air.

I replaced this vent during a warm spell and I'm very impressed.  ZERO frost or cold air coming from the dryer.  It also holds a nice coat of paint to match my drain spouts (yes...wife did not like the plastic color of the vent).

Very happy with the vent.