https://scientific-programs.sc....ience/wiki/Cat_Flap_
This insulated cat flap features a double-flap design and offers a good level of protection in a variety of climates. can be put in wood, uPVC and glass doors. It is important to have a door that seals tightly, particularly during cold weather. It prevents warm air from being sucked out and cold air from getting in and causing energy costs. Wind Resistance Covering your cat's flap for winter will help to keep your home warm by stopping cold air from entering and keeping warm air inside. Most of the best options are insulated
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