https://articlescad.com/adding....-a-cat-flap-to-your-
This insulated cat flap features a double-flap design and offers a good amount of protection for different climates. It can be put in wood, uPVC and glass doors. It is crucial to have a door that can be sealed well, especially in cold weather. It can prevent warm air from being sucked out and cold air from getting in and causing you to pay more energy costs. Wind Resistance Using a cat flap cover for winter will help to keep your home warmer by preventing cold air from getting in and keeping warm air inside. Mos