https://lovewiki.faith/wiki/Fi....t_a_Cat_Flap_in_a_UP
This insulated cat flap has a double-flap system and offers a good amount of protection for different climates. It can be installed in wood, uPVC, glass, and steel doors. A tightly sealed door is crucial, particularly in colder weather. It prevents warm air from getting sucked out and cold air getting in and causing you to pay more energy costs. Wind Resistance Covering your cat's flap for winter will help to keep your home warmer by blocking cold air from entering and allowing warm air within. Most of the best options are