https://keating-espensen-2.fed....eratedjournals.com/c
This insulated cat flap has a double-flap system and offers a good level of protection in various climates. It can be fitted in wood, uPVC, glass, and metal doors. A tightly sealed door is crucial, particularly in cold weather. It keeps warm air from being sucked away and cold air from getting in and causing energy costs. Wind Resistance A cat flap cover for winter will help to keep your home warm by blocking cold air from entering and allowing warm air within. Most of the best options are insulated