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-flap insulated cat flap offers good protection in different climates. It can be used in wood, uPVC and glass doors. A tightly sealed door is essential, especially in cold weather. It keeps warm air from being sucked out and cold air from entering, saving money on energy costs. Wind Resistance Covering your cat's flap for winter can help keep your home warm by blocking cold air from entering and keeping warm air within. Most of the best options are insulated and include a magnetic seal that stops drafts. They also