Product review (5 stars): Perfect.
This vent is well made and the two door design will prove beneficial--not only keeping animals out but also to Lee cold air from coming in. It was a breeze to install--I just drilled a 4" hole with a core bit and slid this in, mounting it to the outside wall with 4 screws. It has about 9 inches of metal vent which is plenty for most applications, including mine where I fished it through a brick and stucco wall. Perfect.