https://sciencewiki.science/wi....ki/Cat_Flap_Glass_Do
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-flap insulated cat flap is a great protection for all climates. It is available in wood, uPVC, glass, and steel doors. A tightly sealed door is essential, especially in colder weather. It helps prevent warm air from getting sucked out and cold air from getting in and causing you to pay more energy costs. Wind Resistance By preventing cold air entering your home and allowing warm air inside the home, a cat flap cover will keep it warmer.
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