https://blogfreely.net/dinghyg....eorge5/through-wall-
If you have a pet or a cat, installing a pet flap inside your French or patio doors is a good idea. It lets them get in and out without having to open the door. There are a variety of options for cat flaps that are designed to fit uPVC composite or wooden doors. Some even come with a four-way locking system that can be set to leave only, in only the direction of opening, or in both. Installation Cat flaps are an excellent way to allow your cat access into and out of your home without opening the front door each time. This is pa