https://postheaven.net/petcalf....2/using-a-cat-flap-i
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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 sealing door is crucial, particularly in cold weather. It stops warm air from being sucked out and cold air from getting in and causing energy costs. Wind Resistance A will help to keep your home warm by stopping cold air from getting in and keeping warm air inside. The majority of the top choices are insulated and have a magnetic seal to
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