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This double-flap, insulated cat flap is a great protection for all climates. It can be fitted in wood, uPVC, glass, and steel doors. A door that is tightly sealed is crucial, particularly in cold weather. It helps prevent warm air from being sucked away and cold air from getting in and causing you to pay more energy costs. Wind Resistance By blocking cold air from entering your home and allowing warm air in the home, a c