https://articlescad.com/window....-with-cat-flap-55674
This double-flap cat flap that is insulated is a great protection for all climates. It can be put in wood, uPVC and glass doors. A tightly sealed door is vital, especially in colder weather. It prevents warm air from being sucked away and cold air from getting in which can save money on energy costs. Wind Resistance By preventing cold air entering your home and allowing warm air inside the cat flap, it will keep it warmer. The best options come with a magnet seal and are protected by insulation. They also come with a lock that ke