https://articlescad.com/window....-with-cat-flap-61149
If you would like to allow your pet to come and go at their own pace, without having to open the door, you can install a cat flap. It is recommended to hire a professional to put in the cat flap. They will help you navigate the complicated process of fitting different types of cat flaps onto various doors and walls. Installation With a cat flap, your pet can come in and leave the house at will, without needing to open the door. There are many different types of pet flaps available, from microchip-reading and bite-proof doors to f