https://notes.io/w5HP4
https://articlescad.com/fittin....g-a-cat-flap-in-a-up
Installing a pet flap on your French or patio doors is a great idea if you own a dog or cat. It allows them to enter and exit without you having to open up the door. There are a myriad of cat flaps available to be used with uPVC wood or composite doors. Some come with a four-way locking system that can be set to exit only or in-only. Installation Cat flaps are an excellent way to allow your cat access into and out of your home without opening the front door every single time. This is part