https://fakenews.win/wiki/Fitt....ing_Cat_Flap_in_UPVC
This cat flap that is insulated has a double-flap system and offers a good amount of protection in various climates. It can be used in wood, uPVC and glass doors. A door that is tightly sealed is essential, especially in colder weather. It can prevent warm air from getting sucked out and cold air from entering and causing you to pay more energy costs. Wind Resistance Using a cat flap cover for winter can help keep your home warmer by blocking cold air from entering and allowing warm air inside. The best options are those tha