https://yamcode.com/installing....-a-cat-flap-in-a-upv
If you leave your cat flap open, it can create draft. This is a common problem experienced by cat owners. A draught-excluder can reduce the amount of cold air that enters the house. However an animal flap offers greater protection against the elements. Tomsgates has a wide selection of insulated dog doors and cat flaps that are suitable for any type of installation, including wall installations. The Material One of the most important features of a cat door is its insulation. This is what will keep cold air out and warm ai