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https://blogfreely.net/davideg....gnog36/cat-flap-inst
This double-flap, insulated cat flap is a great protection for all climates. It can be used in wood, uPVC and glass doors. A tightly sealing door is essential, especially in colder weather. It helps prevent warm air from getting sucked out and cold air from getting in which can save you money on energy costs. Wind Resistance By preventing cold air entering your home and allowing warm air in the home, a cat flap cover keeps it warm. Most of the best options are insula