Product review (2 stars): Does not last
This vent DOES NOT LAST! The plastic of this unit is not very robust. I've been through two of them in the last 4 years and both of the tops cracked and fell off!! It is on the North side of the house and not subjected to much direct sunlight. I WILL NOT be buying a third!  PS It does keep out the cold though, or it would have been 1 star