"I did have one that I had to work on so that the screws would grab the vent. Turns out one of the six vents was too short for the pre-drilled holes, so I had to lower the screws. It was fine after that."
R THouston, TX
"Installed my Critter Quitter® vent protectors this weekend and it was a breeze. What a great product. Here are some pics of the finished product."