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This double-flap cat flap that is insulated is a great protection for all climates. It can be installed in wood, uPVC and glass doors. A tightly sealed door is essential, especially in cold weather. It prevents warm air from being sucked out and cold air from entering, saving money on energy costs. Wind Resistance By preventing cold air entering your home and keeping warm air inside the home, a cat flap cover will keep it warmer. The best ones come with magnet seals and are lined with insulation. They also have locks to k