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This double-flap, insulated cat flap is a great protection for all climates. It can be installed in wood, uPVC and glass doors. A tightly sealed door is crucial, particularly in colder 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 preventing cold air entering your home and keeping warm air inside, a cat flap cover keeps it warm. The majority of the top options are insulated and have a magnetic seal