https://posteezy.com/using-cat-flap-bifold-doors-2
This double-flap, insulated cat flap offers good protection in different climates. It can be installed in wood, uPVC, glass, and steel doors. A door that is tightly sealed is essential, especially in cold weather. It prevents warm air from being sucked away and cold air from getting in which can save you money on energy costs. Wind Resistance Using a cat flap cover for winter will help keep your home warmer by stopping cold air from entering and allowing warm air inside. The best options are those that have a magnet seal and are lined