https://zenwriting.net/fandigg....er5/cat-flaps-for-fr
Installing a cat flap on the door will allow your pet to come and go whenever it wants. Follow the steps below to learn how to trace the shape, cut it with a jigsaw/hole saw and install your cat's flap. You can stop wild animals, pests and stray cats from gaining access to your cat's area if it has a Manual Four-Way Lock. You can also store pots for your cat to hide in. Placement A cat flap can be used to keep animals from entering, such as rodents and cats. Certain models let you close them so that you can control your cat's