https://yamcode.com/adding-a-c....at-flap-to-your-bifo
https://blogfreely.net/kisssoa....p8/installing-a-upvc
Introduce your cat to the flap prior to installation so that they can be familiar with the size and shape. Open the flap and let them explore it from every angle. Make sure the cutout is square and even. Mark the screw holes on the door and align them with the opening of the cat flap The distance between the edges should be equal. Preparation Having a cat flap installed in your home can be beneficial for the health and well-being of your pet. This