The design of installation is just terrible but...
Slightly annoyed with this product, the installation is not easy, it's one of the most frustrating things I've ever had to do. Don't trust the guide provided, it cut a hole bigger than I needed and I’ve had to pad out the bottom and do some repair work on the door. One upside:it's promise of weather proof stands, even with 90mph winds : no breeze coming through. It took my puppy a while to get used to using it, but that’s expected with any dog door. After a week, he's jumping in and out fine.