Double glazing can be equipped with cat and dog flaps that allow your pet to go and go as they please. These are also great to keep your pet safe while you are away. It is possible to put a cat flap inside an existing uPVC panel or double glazing https://cat-flap-fitting-near-me26654.vidublog.com/30070986/installing-a-cat-flap-in-a-upvc-door-cost