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This double-flap insulated cat flap offers good protection in different climates. It can be fitted in wood, uPVC, glass, and metal doors. A tightly sealing door is vital, especially in colder weather. It prevents warm air from being sucked away and cold air from getting in which can save money on energy costs. Wind Resistance Covering your cat's flap for winter will help to keep your home warm by blocking cold air from entering and keeping warm air inside. The best options are those that have a magnet seal a