https://squareblogs.net/dadrai....l33/cat-flaps-for-fr
A cat flap that is built into the wall allows your pet to go in and out whenever they want. Be sure to not install it too high in the wall. This could result in energy loss and the risk of burglars breaking into your home. A cavity with a hole can be a challenge for future owners should you decide to sell your house. Glass cat doors offer a safer alternative. Easy to install A wall-to-wall cat flap is a great option to allow your cat to move around at will. There are a variety of models available and they are easy to install.