https://theflatearth.win/wiki/....Post:How_Much_to_Ins
This double-flap insulated cat flap offers good protection in different climates. It can be fitted in wood, uPVC, glass, and metal doors. A tightly sealing door is vital, especially in colder weather. It prevents warm air from being sucked away and cold air getting in which can save you money on energy costs. Wind Resistance Covering your cat's flap for winter can help keep your home warmer by preventing cold air from entering and keeping warm air within. Most of the best options are insulated and have a magnetic seal th
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