This cat flap that is insulated features a double-flap design and provides a high level of protection in a variety of climates. It is available in wood, uPVC, glass, and steel doors. A tightly sealed door is essential, especially in colder weather. It keeps warm air from being sucked out https://catflapdoubleglazing57876.blogsmine.com/31273537/installing-a-cat-flap-in-a-upvc-door-cost